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http://indianaquariumhobbyist.com/community/ :: View topic - DIY LED for planted tank(Trial fixture upgrade)
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DIY LED for planted tank(Trial fixture upgrade)
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Rajdeep_Banik
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PostPosted: Fri Jun 05, 2015 1:54 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
bharadwazputta  wrote  (View  Post):                
If  I  am  connecting  three  1  amp  LEDs  in  parallel,  using  12V  3amps  driver,  what  happens  if  one  of  my  led  burns  out,  will  the  current  flow  in  other  LEDs  increase  and  burn  out?                

 LED  will  only  suck  more  current  when  it  becomes  hot,  and  the  more  it  sucks  current,  the  more  hotter  it  becomes!  Its  best  to  use  a  current  limiting  driver  for  LEDs.  You  can  buy  current  limiting  drivers,  they  are  quite  costly,  or  if  you  can  make  it,  it  will  be  a  lot  cheaper!  Here  is  a  Website  you  can  learn  from.
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Andrew
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PostPosted: Fri Jun 05, 2015 4:45 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Rajdeep_Banik  wrote  (View  Post):                
So  you  are  saying  if  I  add  CO2  with  my  current  lights,  it  will  be  OK?  I  added  a  diy  CO2  once  through  the  internal  filter  powerhead,  but  there  was  no  difference  in  the  tank.  Even  green  algae  looks  good,  but  brown  algae  makes  the  tank  look  dirty!  
 If  I  add  high  LED  lights,  will  the  brown  algae  go  away?  I  am  willing  to  remove  most  of  the  plants,  only  2  or  3  nice  plants  are  enough  for  my  tank  as  it  mainly  fish  oriented  (angelfish).
 I  can't  go  for  pressurized  CO2,  as  it  is  not  available  here,  and  I  can  try  diy  again,  what  do  you  suggest?                

 
 you  need  to  give  your  full  tank  spec  to  see  the  issue  like  i  said  if  you  have  light  then  your  co2  should  be  good  enough.  do  tell  your  tank  spec,  size,light,filter....
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Andrew
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PostPosted: Fri Jun 05, 2015 5:08 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
kannan_kollam  wrote  (View  Post):                
Hi  Andrew,
 
 "in   some   smps   when   take   current   from   12v   you   will   see   voltage   drop   in   3.3v   that   means   your   smps   is   not   circuited   properly"
 How  can  i  check  if  there  is  a  voltage  drop  ?.  if  multimeters  shows  constant  reading  of  around  12  ±  V  ,  does  it  mean  no  voltage  drop  ?
 
 Also  ,  i  happened  to  read  some  posts  saying  LED  are  current  driven  and  hence  we  should  maintain  the  current.
 
 source:
 As  LEDs  heat  up,  the  forward  voltage  drops  and  the  current  passing  through  the  LED  increases.  The  increased  current  generates  additional  heating  of  the  junction.  If  nothing  limits  the  current,  the  junction  will  fail  due  to  the  heat.  This  phenomenon  is  referred  to  as  thermal  runaway.
 By  driving  LED  light  sources  with  a  regulated  constant-current  power  supply  issues  resulting  from  voltage  variation  and  voltage  changes  can  be  eliminated.  Therefore,  constant  current  drivers  are  generally  recommended  for  powering  LED  light  sources.

 
 so  do  i  need  to  regulate  the  current  in  my  smps  (12v  10Amps)  to  drive  8  X  Cool  white(12v  750mA)  in  parallel?.
 
 I  saw  this  buck  module  to  regulate  V  and  I,but  its  only  5amps  
 http://www.ebay.in/itm/5A-Lithium-Charger-CV-CC-Buck-Step-down-Power-Supply-Module-LED-Driver-/181753115637?
 http://www.inkocean.in/5a-constant-current-lithium-ion-battery-constant-current-buck-led-driver-power-supply-module-c6b3
 
 i  truly  appreciate  your  support  
 
 Regards,
 Kannan
 
                                                   
Andrew  wrote  (View  Post):                
                                                 
kannan_kollam  wrote  (View  Post):                
                                                 
Andrew  wrote  (View  Post):                
                                                 
kannan_kollam  wrote  (View  Post):                
Hi  Andrew,
 
 i  have  a  24  X  12  inch  tank  and  i  am  planning  to  build  a  similar  light  fixture.please  help  me  with  few  queries
 
 As  per  the  your  formula  i  have  calaculated  the  watts  required  .
   24X12=  288.  
   288/22=13.09  (rounding  it  to  14)  
   14  X  3  =  42  watt
   i  am  going  for  40  watts.
   
 Here  is  the  list  of  led  im  planning  to  buy  from  ebay.
 I  am  planning  to  use  8x5watt  cool  white  instead  of  4X10  watts.is  that  ok  ?
 
 Cool  white  
 ---------------
 8  cool  wite  x  5Watt  =  40watts  .12  volts  
 http://www.ebay.in/itm/5-pcs-5W-High-power-Bright-5-Watt-SMD-LED-Diode-Bulb-Light-cool-White-/321710879192?pt=LH_DefaultDomain_203&hash=item4ae77671d8
 
 Blue  Led
 ---------------
 4  blue  led  .1  watt.(volts  not  specified  by  seller,guess  it  would  be  3-3.5  v)
 http://www.ebay.in/itm/10-pcs-BLUE-COLOR-LED-diode-1W-High-power-1-Watt-BLUE-COLOR-free-shipping-/321697954133?pt=LH_DefaultDomain_203&hash=item4ae6b13955
 
 Red  Led
 ---------------
 2  red  led  .1  watt.(volts  not  specified  by  seller,guess  it  would  be  3-3.5  v)
 http://www.ebay.in/itm/10-pcs-RED-COLOR-LED-diode-1W-High-power-1-Watt-RED-COLOR-free-shipping-/321697952864?pt=LH_DefaultDomain_203&hash=item4ae6b13460
 
 can  you  please  advice  whether  the  kevlin  and  lumin  are  correct  .if  not  please  let  me  know  the  exact  kevin  and  lumin  required  for  cool  white,red  and  blue.
 Also  which  potentiometer  should  i  buy  ?

 
 With  Regards,  
 Kannan                

 
 Hi  kannan,
 
 Sorry  i  didn't  see  the  potentiometer  question  you  asked  always  calculate  the  input  to  your  potentiometer  that  way  its  too  secure  that  is  if  your  driver  output  is  15A  then  calculate  for  15A,  below  is  the  formula  to  calculate
 
 V  =  I  x  R   (Voltage  =  Current  multiplied  by  Resistance)
 
 R  =  V  /  I   (Resistance  =  Voltage  divided  by  Current)
 
 I  =  V  /  R   (Current  =  Voltage  Divided  by  Resistance)
 
 p  =  V  *  I  
 
 V  is  the  volt  you  use  and  R  is  resistance  I  is  Amps  and  P  is  watts
 
 say  for  example  i  used  12v  24Amps  smps  so  p  =  12  *  24  which  gives  288watts  when  you  convert  into  kilowatt  it  comes  0.288  so  you  can  get  1kilo  watt  potentiometer  to  dim  total  leds
 
 below  is  the  online  calculator  for  DC  ohms  law,  using  this  calculator  calculate  your  power  and  resistance  value  accordingly  get  your  potentiometer  Smile  remember  give  your  total  output  amps  of  your  driver.  And  it  doesn't  matter  how  many  leds  you  connect  to  your  pot.
 
 http://www.rapidtables.com/calc/electric/ohms-law-calculator.htm#dc
 
 please  note  leds  will  come  in  milliamps  to  convert  into  amps  divide  by  1000  example  say  your  5  watt  led  takes  750milliamps  and  you  using  8  nos  so  8*750  =  6000  milliamps  and  amps  =  6000/1000=6  Amps  total  so  always  in  above  formula  you  need  to  use  amps  not  milliamps.                

 
 Hi   
 
 Andrew,thanks  for  the  detailed  explanation.
 im  currently  planning  to  use  an  old  smps  with  the  following  rating
 +5v  27A
 +12v  10A
 +3.3v  24A
 
 my  plan  is  to  arrange  my  8X5w  cool  white  in  two  heatsink  ,so  each  heatsink  will  have  4  cool  white  controlled  by  individual  dimmer.
 Also  ill  add  a  dimmer  for  red.
 
 What  do  you  think  of  using  the  following  for  dimming  my  cool  whites  instead  of  pot?
 http://www.ebay.in/itm/12V-Mini-LED-Controller-Dimmer-3-Keys-5-Modes-for-LED-Strip-SMD-3528-5050-5630-/281437926792?pt=LH_DefaultDomain_203&hash=item418701f588
 
 Regards,
 Kannan                

 
 Hi  Kannan,
 
 Sorry  for  late  reply  as  i  was  out  of  town  was  not  ablr  to  reply  fast.
 
 when  selecting  dimmer  you  need  to  check  the  amps  you  using  led  8nos  which  is  5w  and  750mA  so  your  total  amps  is
 
 8*750  =  6000  which  is  6000/1000=6Amps  the  above  link  you  provided  they  didn't  give  any  spec  see  the  below  dimmer  which  is  12v  6Amp  perfect  for  your  project  and  can  dim  all  the  8  leds
 
 http://www.ebay.in/itm/DC-12V-6A-Mini-Led-Dimmer-5-Modes-6-Level-single-colors-Brightness-Adjustable-/111677388184?pt=LH_DefaultDomain_203&hash=item1a007db598
 
 in  some  smps  when  take  current  from  12v  you  will  see  voltage  drop  in  3.3v  that  means  your  smps  is  not  circuited  properly,  so  try  to  use  good  brand  smps  to  sort  out  this  issue.  below  is  video  where  you  can  make  your  smps  into  good  looking  driver  
 https://www.youtube.com/watch?v=QoGnOoTICGY
 
 And  if  you  face  the  issue  like  i  mentioned  above  then  connect  your  3.3v  led  in  your  12v  itself  but  you  need  to  connect  in  series  for  spliting  the  volt  correct  use  the  calculator  below
 
 http://led.linear1.org/led.wiz
 
 http://ledcalc.com/#calc
 
 in  above  calculator  you  can  check  for  series  and  parallel  connection  if  you  have  trouble  checking  let  me  know  will  guide  you.
 
 white  leds  make  in  parallel  no  issue.  if  you  got  any  doubt  let  me  know  so  i  can  make  a  wiring  diagram  for  you.  And  please  note  too  many  blue  and  red  will  cause  hell  of  a  algae  in  glass.  most  of  them  following  my  setup  actually  red  and  blue  led  not  at  all  required  if  you  are  good  in  calculating  spectrum  using  led  spec  then  select  the  leds  accordingly  or  just  use  2  blue  and  1  red  with  some  dimmer  to  control  it.  or  make  provision  like  disconnecting  and  connecting  using  switch  to  red  and  blue  led  line.                
               

 
 Hi  when  you  work  on  smps  you  will  see  the  difference  that  is  when  you  give  more  load  to  12v  and  when  you  less  load  to  3v  then  you  will  see  voltage  drop  but  that  can  be  easily  rectified  by  adding  a   dummy  load  i  have  already  given  all  the  links  for  that  do  check  the  video  link  i  provided  earlier.
 
 And  yes  led  driven  mainly  by  current  but  that  doesn't  mean  it  will  take  all  available  current  that  is  totally  wrong  and  say  for  example  if  you  use  2  led  with  12v  2amps  total  and  if  you  connect  with  a  driver  which  can  give  12v  1amp  also  it  will  lit  up  but  brightness  won't  be  there  and  same  like  that  if  you  connect  with  12v  30A  driver  it  will  take  only  2Amps  current  only  it  won't  take  30A  because  when  the  led  cross  the  limiting  current  it  will  burn,  for  you  guys  i  have  taken  some  pictures  to  show  that.  And  for  you  kannan  i  specially  added  a  dimmer  to  show  how  it  works:)
 
 below  is  the  smps  i'm  using  has  driver  which  gives  12v  18A  output,  i  connected  3  leds  in  parallel  and  connected  to  the  smps  and  also  see  the  multimeter  to  check  the  total  amps  it's  taking,  so  please  do  understand  led  will  take  what  current  it  requires  only  so  don't  get  confused.
 
 My  SMPS  which  gives  12v  18A
 
 
 3  LED's  connected  to  smps  which  takes  only  1.78Amps
 
 
 Below  is  the  picture  where  the  same  leds  connected  to  12v  30A  led  driver

 
 
 And  kannan  you  were  asking  about  dimmer  where  i  gave  a  link  and  below  is  the  same  dimmer  which  is  12v  6A
 With  full  brightness  setup  in  dimmer
 
 
 with  low  brightness  using  dimmer
 
 
 so  from  above  pictures  you  can  see  led  takes  only  the  amps  it  requires,  they  are  not  humans  to  take  all  ROFL   jus  kidding.
 
 And  for  your  setup  you  don't  require  any  buck  module  and  all  smps  is  more  than  enough  i  already  told  your  total  amps  is  6  only,  sure  your  smps  will  have  more  than  that.  do  check  the  video  for  making  smps  into  proper  lab  use  if  you  got  doubt  will  give  drawing  so  make  the  changes  accordingly  in  the  smps.
 
 And  don't  worry  about  extra  amps  present  in  your  led  driver  because  led  will  take  what  it  requires  but  use  good  wire  for  the  total  amps  you  have  when  using  any  driver  or  smps.
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Rajdeep_Banik
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Joined: Jun 23, 2012
Posts: 193
Location: Agartala, Tripura

Status: Offline
PostPosted: Fri Jun 05, 2015 5:14 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Andrew  wrote  (View  Post):                
you  need  to  give  your  full  tank  spec  to  see  the  issue  like  i  said  if  you  have  light  then  your  co2  should  be  good  enough.  do  tell  your  tank  spec,  size,light,filter....                

 
 Tank  size:  48  x  18  x  18  inches.
 Light:  3  X  T8(4  ft)  +  2  x  23W  CFLs.
 Filter:  Internal  power  filter  +  radial  powerhead  (wavemaker  type).  I  also  have  a  sump,  but  that  is  unused,  since  it  is  difficult  to  clean.
 No  CO2.
 Substrate:  river  sand  (above)  +  garden  soil  (below).
 Plants:  Java  fern  (very  poor  condition,  low  growth)  ,  A  species  of  "Aponogetons"  (low  growth,  but  sprouts  plantlets  every  few  weeks)  ,  Water  lettuce  (very  good  condition)
 Ferts:  DIY,  Stopped  for  the  last  few  months,  as  there  was  no  change
 
 The  whole  setup  has  been  running  for  atleast  2  years.
 Previous  posts  here
 
 A  picture  before  adding  the  T8  tubes  (about  a  year  ago):  
 
 Today:
 
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Andrew
Regular Poster on IAH
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Joined: Apr 03, 2014
Posts: 393
Location: Coimbatore

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PostPosted: Fri Jun 05, 2015 5:15 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
bharadwazputta  wrote  (View  Post):                
If  I  am  connecting  three  1  amp  LEDs  in  parallel,  using  12V  3amps  driver,  what  happens  if  one  of  my  led  burns  out,  will  the  current  flow  in  other  LEDs  increase  and  burn  out?                

 
 dont  worry  led  won't  burn  that  easy  they  are  tough  guys  and  when  in  parallel  if  one  goes  also  balance  will  work,  and  again  and  again  i'm  saying  leds  will  take  only  what  amps  it  requires  it  won't  take  more  amps  then  required  so  no  worries.  please  check  above  post  of  mine  gave  examples  with  pictures.
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kannan_kollam
IAH New Member
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Joined: May 21, 2015
Posts: 5
Location: kollam

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PostPosted: Fri Jun 05, 2015 8:29 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Andrew  wrote  (View  Post):                
                                                 
kannan_kollam  wrote  (View  Post):                
Hi  Andrew,
 
 "in   some   smps   when   take   current   from   12v   you   will   see   voltage   drop   in   3.3v   that   means   your   smps   is   not   circuited   properly"
 How  can  i  check  if  there  is  a  voltage  drop  ?.  if  multimeters  shows  constant  reading  of  around  12  ±  V  ,  does  it  mean  no  voltage  drop  ?
 
 Also  ,  i  happened  to  read  some  posts  saying  LED  are  current  driven  and  hence  we  should  maintain  the  current.
 
 source:
 As  LEDs  heat  up,  the  forward  voltage  drops  and  the  current  passing  through  the  LED  increases.  The  increased  current  generates  additional  heating  of  the  junction.  If  nothing  limits  the  current,  the  junction  will  fail  due  to  the  heat.  This  phenomenon  is  referred  to  as  thermal  runaway.
 By  driving  LED  light  sources  with  a  regulated  constant-current  power  supply  issues  resulting  from  voltage  variation  and  voltage  changes  can  be  eliminated.  Therefore,  constant  current  drivers  are  generally  recommended  for  powering  LED  light  sources.

 
 so  do  i  need  to  regulate  the  current  in  my  smps  (12v  10Amps)  to  drive  8  X  Cool  white(12v  750mA)  in  parallel?.
 
 I  saw  this  buck  module  to  regulate  V  and  I,but  its  only  5amps  
 http://www.ebay.in/itm/5A-Lithium-Charger-CV-CC-Buck-Step-down-Power-Supply-Module-LED-Driver-/181753115637?
 http://www.inkocean.in/5a-constant-current-lithium-ion-battery-constant-current-buck-led-driver-power-supply-module-c6b3
 
 i  truly  appreciate  your  support  
 
 Regards,
 Kannan
 
                                                   
Andrew  wrote  (View  Post):                
                                                 
kannan_kollam  wrote  (View  Post):                
                                                 
Andrew  wrote  (View  Post):                
                                                 
kannan_kollam  wrote  (View  Post):                
Hi  Andrew,
 
 i  have  a  24  X  12  inch  tank  and  i  am  planning  to  build  a  similar  light  fixture.please  help  me  with  few  queries
 
 As  per  the  your  formula  i  have  calaculated  the  watts  required  .
   24X12=  288.  
   288/22=13.09  (rounding  it  to  14)  
   14  X  3  =  42  watt
   i  am  going  for  40  watts.
   
 Here  is  the  list  of  led  im  planning  to  buy  from  ebay.
 I  am  planning  to  use  8x5watt  cool  white  instead  of  4X10  watts.is  that  ok  ?
 
 Cool  white  
 ---------------
 8  cool  wite  x  5Watt  =  40watts  .12  volts  
 http://www.ebay.in/itm/5-pcs-5W-High-power-Bright-5-Watt-SMD-LED-Diode-Bulb-Light-cool-White-/321710879192?pt=LH_DefaultDomain_203&hash=item4ae77671d8
 
 Blue  Led
 ---------------
 4  blue  led  .1  watt.(volts  not  specified  by  seller,guess  it  would  be  3-3.5  v)
 http://www.ebay.in/itm/10-pcs-BLUE-COLOR-LED-diode-1W-High-power-1-Watt-BLUE-COLOR-free-shipping-/321697954133?pt=LH_DefaultDomain_203&hash=item4ae6b13955
 
 Red  Led
 ---------------
 2  red  led  .1  watt.(volts  not  specified  by  seller,guess  it  would  be  3-3.5  v)
 http://www.ebay.in/itm/10-pcs-RED-COLOR-LED-diode-1W-High-power-1-Watt-RED-COLOR-free-shipping-/321697952864?pt=LH_DefaultDomain_203&hash=item4ae6b13460
 
 can  you  please  advice  whether  the  kevlin  and  lumin  are  correct  .if  not  please  let  me  know  the  exact  kevin  and  lumin  required  for  cool  white,red  and  blue.
 Also  which  potentiometer  should  i  buy  ?

 
 With  Regards,  
 Kannan                

 
 Hi  kannan,
 
 Sorry  i  didn't  see  the  potentiometer  question  you  asked  always  calculate  the  input  to  your  potentiometer  that  way  its  too  secure  that  is  if  your  driver  output  is  15A  then  calculate  for  15A,  below  is  the  formula  to  calculate
 
 V  =  I  x  R   (Voltage  =  Current  multiplied  by  Resistance)
 
 R  =  V  /  I   (Resistance  =  Voltage  divided  by  Current)
 
 I  =  V  /  R   (Current  =  Voltage  Divided  by  Resistance)
 
 p  =  V  *  I  
 
 V  is  the  volt  you  use  and  R  is  resistance  I  is  Amps  and  P  is  watts
 
 say  for  example  i  used  12v  24Amps  smps  so  p  =  12  *  24  which  gives  288watts  when  you  convert  into  kilowatt  it  comes  0.288  so  you  can  get  1kilo  watt  potentiometer  to  dim  total  leds
 
 below  is  the  online  calculator  for  DC  ohms  law,  using  this  calculator  calculate  your  power  and  resistance  value  accordingly  get  your  potentiometer  Smile  remember  give  your  total  output  amps  of  your  driver.  And  it  doesn't  matter  how  many  leds  you  connect  to  your  pot.
 
 http://www.rapidtables.com/calc/electric/ohms-law-calculator.htm#dc
 
 please  note  leds  will  come  in  milliamps  to  convert  into  amps  divide  by  1000  example  say  your  5  watt  led  takes  750milliamps  and  you  using  8  nos  so  8*750  =  6000  milliamps  and  amps  =  6000/1000=6  Amps  total  so  always  in  above  formula  you  need  to  use  amps  not  milliamps.                

 
 Hi   
 
 Andrew,thanks  for  the  detailed  explanation.
 im  currently  planning  to  use  an  old  smps  with  the  following  rating
 +5v  27A
 +12v  10A
 +3.3v  24A
 
 my  plan  is  to  arrange  my  8X5w  cool  white  in  two  heatsink  ,so  each  heatsink  will  have  4  cool  white  controlled  by  individual  dimmer.
 Also  ill  add  a  dimmer  for  red.
 
 What  do  you  think  of  using  the  following  for  dimming  my  cool  whites  instead  of  pot?
 http://www.ebay.in/itm/12V-Mini-LED-Controller-Dimmer-3-Keys-5-Modes-for-LED-Strip-SMD-3528-5050-5630-/281437926792?pt=LH_DefaultDomain_203&hash=item418701f588
 
 Regards,
 Kannan                

 
 Hi  Kannan,
 
 Sorry  for  late  reply  as  i  was  out  of  town  was  not  ablr  to  reply  fast.
 
 when  selecting  dimmer  you  need  to  check  the  amps  you  using  led  8nos  which  is  5w  and  750mA  so  your  total  amps  is
 
 8*750  =  6000  which  is  6000/1000=6Amps  the  above  link  you  provided  they  didn't  give  any  spec  see  the  below  dimmer  which  is  12v  6Amp  perfect  for  your  project  and  can  dim  all  the  8  leds
 
 http://www.ebay.in/itm/DC-12V-6A-Mini-Led-Dimmer-5-Modes-6-Level-single-colors-Brightness-Adjustable-/111677388184?pt=LH_DefaultDomain_203&hash=item1a007db598
 
 in  some  smps  when  take  current  from  12v  you  will  see  voltage  drop  in  3.3v  that  means  your  smps  is  not  circuited  properly,  so  try  to  use  good  brand  smps  to  sort  out  this  issue.  below  is  video  where  you  can  make  your  smps  into  good  looking  driver  
 https://www.youtube.com/watch?v=QoGnOoTICGY
 
 And  if  you  face  the  issue  like  i  mentioned  above  then  connect  your  3.3v  led  in  your  12v  itself  but  you  need  to  connect  in  series  for  spliting  the  volt  correct  use  the  calculator  below
 
 http://led.linear1.org/led.wiz
 
 http://ledcalc.com/#calc
 
 in  above  calculator  you  can  check  for  series  and  parallel  connection  if  you  have  trouble  checking  let  me  know  will  guide  you.
 
 white  leds  make  in  parallel  no  issue.  if  you  got  any  doubt  let  me  know  so  i  can  make  a  wiring  diagram  for  you.  And  please  note  too  many  blue  and  red  will  cause  hell  of  a  algae  in  glass.  most  of  them  following  my  setup  actually  red  and  blue  led  not  at  all  required  if  you  are  good  in  calculating  spectrum  using  led  spec  then  select  the  leds  accordingly  or  just  use  2  blue  and  1  red  with  some  dimmer  to  control  it.  or  make  provision  like  disconnecting  and  connecting  using  switch  to  red  and  blue  led  line.                
               

 
 Hi  when  you  work  on  smps  you  will  see  the  difference  that  is  when  you  give  more  load  to  12v  and  when  you  less  load  to  3v  then  you  will  see  voltage  drop  but  that  can  be  easily  rectified  by  adding  a   dummy  load  i  have  already  given  all  the  links  for  that  do  check  the  video  link  i  provided  earlier.
 
 And  yes  led  driven  mainly  by  current  but  that  doesn't  mean  it  will  take  all  available  current  that  is  totally  wrong  and  say  for  example  if  you  use  2  led  with  12v  2amps  total  and  if  you  connect  with  a  driver  which  can  give  12v  1amp  also  it  will  lit  up  but  brightness  won't  be  there  and  same  like  that  if  you  connect  with  12v  30A  driver  it  will  take  only  2Amps  current  only  it  won't  take  30A  because  when  the  led  cross  the  limiting  current  it  will  burn,  for  you  guys  i  have  taken  some  pictures  to  show  that.  And  for  you  kannan  i  specially  added  a  dimmer  to  show  how  it  works:)
 
 below  is  the  smps  i'm  using  has  driver  which  gives  12v  18A  output,  i  connected  3  leds  in  parallel  and  connected  to  the  smps  and  also  see  the  multimeter  to  check  the  total  amps  it's  taking,  so  please  do  understand  led  will  take  what  current  it  requires  only  so  don't  get  confused.
 
 My  SMPS  which  gives  12v  18A
 
 
 3  LED's  connected  to  smps  which  takes  only  1.78Amps
 
 
 Below  is  the  picture  where  the  same  leds  connected  to  12v  30A  led  driver

 
 
 And  kannan  you  were  asking  about  dimmer  where  i  gave  a  link  and  below  is  the  same  dimmer  which  is  12v  6A
 With  full  brightness  setup  in  dimmer
 
 
 with  low  brightness  using  dimmer
 
 
 so  from  above  pictures  you  can  see  led  takes  only  the  amps  it  requires,  they  are  not  humans  to  take  all  ROFL   jus  kidding.
 
 And  for  your  setup  you  don't  require  any  buck  module  and  all  smps  is  more  than  enough  i  already  told  your  total  amps  is  6  only,  sure  your  smps  will  have  more  than  that.  do  check  the  video  for  making  smps  into  proper  lab  use  if  you  got  doubt  will  give  drawing  so  make  the  changes  accordingly  in  the  smps.
 
 And  don't  worry  about  extra  amps  present  in  your  led  driver  because  led  will  take  what  it  requires  but  use  good  wire  for  the  total  amps  you  have  when  using  any  driver  or  smps.                

 
 Hi  Andrew,
 
 wow!!!  ths  super  cool...  Now  i  should  stop  worring  and  start  building  my  fixture.
 Man,  thanks  a  lot  for  taking  the  trouble  to  take  pics  and  expaling  it  well   Thumb Up   Thumb Up   Thumb Up  
 
 Between,  there  is  a  sligh  change  in  plan  .Before  building  my  40watts  fixture  im  going  to  build  20-24watts  for  my  friend  who  is  new  in  this  hobby.
 
 Tank  size  24X12X12inch  lowtech.so  the  calculation  i  made  for  him  (please  correct  me)
 24X12=288.     
 288/22=13.09(we  will  use  14)     
 14  X1.5(watts  per  gallon)=21watt(currently  planning  to  go  for  24)  .
 
 8  Led  3wleds  cool  white   
 2  Blue  1w  leds.
 
 http://www.ebay.in/itm/3W-LED-Beads-CoolWhite-10-Pcs-High-Power-UltraBright-True-3-Watt-Beads-Growlight-/171792336353?
 http://www.ebay.in/itm/5pcs-LED-diode-1W-High-power-BLUE-Ultra-Bright-True-1-Watt-Lamp-Beads-Grow-light-/171812440888?
 or  this  royal  blue  led
 http://www.ebay.in/itm/High-bright-Quality-Power-ROYAL-BLUE-LED-light-Lamp-2-Watt-1-Set-25-Pcs-/271831789599?
 Also  a  dimmer  to  controll  blue  leds.
 
 Regarding  the  smps  voltage  drop  thing,  this  is  what  i  have  understood  so  far.
 If  we  are  using  both  12v  and  3.3v  simultaneously  and  there  is  more  load  on  12v  then  there  might  be  a  voltage  drop  in  3.3v.
 And  this  is  the  case  only  for  some  smps.
 
 Regards,
 Kannan
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Andrew
Regular Poster on IAH
Regular Poster on IAH



Joined: Apr 03, 2014
Posts: 393
Location: Coimbatore

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PostPosted: Fri Jun 05, 2015 8:30 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Eureca  wrote  (View  Post):                
I  appreciate  your  job  Andrew  .  and  above  all  the  time  u  have  spent   providing  infos  to  the  newbies  .                

 
 Thank  Smile  
 
 
                                                 
Thuds  wrote  (View  Post):                

 Great  job  Andrew  keep  posting  very  informative  and  will  assist  all  wanting  to  switch  to  LED.
 
 Thuds
                 

 
 Thanks   Smile
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shyamhegde
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Frequent Visitor to IAH



Joined: May 17, 2013
Posts: 241
Location: Bangalore

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PostPosted: Fri Jun 05, 2015 9:50 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Andrew  wrote  (View  Post):                
                                                 
bharadwazputta  wrote  (View  Post):                
If  I  am  connecting  three  1  amp  LEDs  in  parallel,  using  12V  3amps  driver,  what  happens  if  one  of  my  led  burns  out,  will  the  current  flow  in  other  LEDs  increase  and  burn  out?                

 
 dont  worry  led  won't  burn  that  easy  they  are  tough  guys  and  when  in  parallel  if  one  goes  also  balance  will  work,  and  again  and  again  i'm  saying  leds  will  take  only  what  amps  it  requires  it  won't  take  more  amps  then  required  so  no  worries.  please  check  above  post  of  mine  gave  examples  with  pictures.                

 
 Use  the  proper  driver.  If  you  do  not  use  constant  current  driver,  chances  of  more  heat,  more  current  cycle  cause  LED  to  run  exceeding  maximum  operating  temperature  and  cause  thermal  runaway.
 Matching  your  driver  (wattage  and  current)  to  LED  array  will  help.  They  die  in  seconds  if  not  handled  well.
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Rajdeep_Banik
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PostPosted: Sat Jun 06, 2015 5:10 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Mr.  Andrew,  please  help  me.  I  need  to  make  the  fixture  before  my  vacations  are  over.  Anybody  else  who  keeps  LED  planted  aquarium,  please  help!
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Rajdeep_Banik
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PostPosted: Wed Jun 10, 2015 3:29 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 How  is  this  LED  arrangement?  Any  suggestions?
 15  x  10  watt  white  ,  8  x  1watt  blue  ,  4  x  1  watt  red
 
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PostPosted: Thu Jun 11, 2015 2:05 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Rajdeep_Banik  wrote  (View  Post):                
How  is  this  LED  arrangement?  Any  suggestions?
 15  x  10  watt  white  ,  8  x  1watt  blue  ,  4  x  1  watt  red
                 

 
 High  go  for  20Nos  led  for  better  distribution  around  tank  and  have  only  2rows  make  a  fixture  of  48  X  9  X  height  differs  from  heat  sink  always  keep  breadth  half  of  your  tank  breadth.  and  paste  the  leds  in  end  of  the  heatsink,  and  use  5  blue  and  2  red  which  is  more  than  enough  because  your  cob  led  will  have  blue  spectrum  so  don't  add  more  blue  which  will  because  algae  formation  in  glass.
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Rajdeep_Banik
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PostPosted: Thu Jun 11, 2015 3:14 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Ok,  I  have  modified  the  design,  please  have  a  look.  Now,  there  are  18  x  10  Watt  white,  5  x  1W  blue,  2  x  1W  red.
 
 
 
 All  the  smaller  lights  are  in  the  middle?  Will  there  be  any  'disco  effect'?
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Andrew
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PostPosted: Thu Jun 11, 2015 3:31 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Nice  one  but  change  the  position  of  red  led  to  fan  i.e.,  blue,fan,red  and  3  blue  led,  red  led,  fan  and  blue  led  and  make  sure  the  air  from  fan  hits  on  heat  sink  or  try  to  place  each  fan  on  top  of  led.
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PostPosted: Thu Jun 11, 2015 5:12 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 
 Won't  there  be  some  areas  where  the  water  will  be  blue  and  some  areas  where  the  water  will  look  red?
 The  fans  are  for  cooling  the  aquarium  water,  not  for  the  heatsinks.  There  will  be  separate  fans  for  cooling  the  heatsink,  if  required.  
 Also,  will  two  rows  of  LED  light  up  the  whole  tank  uniformly?  Or  will  there  be  some  low  light  areas?
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log1102
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PostPosted: Tue Jul 28, 2015 3:53 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Dear  Andrew,
 
 Thank  you  for  this  thread.   I  came  across  it  last  week  and  learned  a  lot.
 
 Inspired  by  you,  I  have  decided  to  try  to  build  an  LED  fixture  for  my  36"x12"x18"  tank  (planted).   I  searched  on  the  net  for  more  info  and  found  that  most  people  are  saying  to  use  constant  current  drivers  or  constant  voltage  with  resistors.   As  far  as  I  understand,  you  have  used  constant  voltage  without  resistors,  connecting  the  LEDs  in  parallel.   How  has  the  performance  of  your  fixture  been?   Have  you  faced  any  problems?
 
 I  have  bought  the  following  supplies:
 
 12V  20A  240W  power  supply
 http://www.ebay.in/itm/321806033290?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
 
 10W  12V  1A  LEDs  Cool  White  (The  seller  called  and  informed  me  that  these  are  china  LEDs  and  output  will  be  7.2  to  8.5  W)
 http://www.ebay.in/itm/321809208100?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
 
 LED  Controllers
 http://www.ebay.in/itm/201381337137?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
 
 Heatsink  not  yet  sourced.
 
 I  am  planning  to  connect  12  LEDs  in  parallel.   Please  can  you  check  the  supplies  and  let  me  know  if  they  are  ok  for  the  project?   Thanks  in  advance   Smile
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