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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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Andrew
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PostPosted: Thu May 28, 2015 5:29 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
syed  wrote  (View  Post):                
very  nice  and  neat  fixture  you  have  created  andrew.                

 
 Thank  you  Smile
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bharadwazputta
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PostPosted: Fri May 29, 2015 1:21 am Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 how  did  you  check  the  lumen   by  using  your  mobile?  is  there  any  app?
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PostPosted: Fri May 29, 2015 1:28 am Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 can  u  direct  me  towards  a  genuine  seller  who  can  provide  me  with  the  data  sheet  on  led
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PostPosted: Fri May 29, 2015 1:06 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 if  you  buy  from  ebay  then  most  of  them  have  listed  the  datasheet.  The  ebay  links  given  by  andrew,  they  have  given  the  details
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Andrew
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PostPosted: Sat May 30, 2015 1:34 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
bharadwazputta  wrote  (View  Post):                
how  did  you  check  the  lumen   by  using  your  mobile?  is  there  any  app?                

 
 There  are  plenty  of  apps  just  search  for  lux  meter  i  checked  because  my  mobile  is  xperia  z1  which  is  waterproof  Very Happy  
 
 
                                                 
bharadwazputta  wrote  (View  Post):                

 can  u  direct  me  towards  a  genuine  seller  who  can  provide  me  with  the  data  sheet  on  led
                 

 
 I  have  already  given  the  details  in  my  old  post  check  the  below  link  where  i  bought  my  materials
 
 http://indianaquariumhobbyist.com/community/modules.php?name=Forums&file=viewtopic&t=38122
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PostPosted: Sat May 30, 2015 1:50 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
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.
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kannan_kollam
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PostPosted: Sun May 31, 2015 11:15 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,
 
 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
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PostPosted: Tue Jun 02, 2015 2:08 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Hi  Andrew,  can  you  help  me  out  a  bit  here.  If  I  want  to  replace  my  tubes  with  LEDs  as  they  are  quite  old  now,  which  colour  will  be  best  for  plant  growth?  I  have  more  than  100Watts  of  light  but  still  there  are  brown  patches  in  the  tank,  the  plant  growth  is  very  low.  My  tank  is  48x18x18  inches.  I  have  read  your  linked  articles,  and  it  shows  that  red  and  blue  light  is  best  for  plants.  So,  if  I  put  mainly  1W  LEDs  of  red  and  blue  in  2:1  ratio,  will  it  be  enough  for  plant  growth?  Also  a  few  10W  LEDs  for  viewing.  What  do  you  suggest?  How  many  LEDs  will  be  needed?  And,  will  the  1W  LEDs  from  ebay  reach  the  bottom  of  the  tank?  
 
 Thanks  in  advance.
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Eureca
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PostPosted: Tue Jun 02, 2015 2:56 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 I  appreciate  your  job  Andrew  .  and  above  all  the  time  u  have  spent   providing  infos  to  the  newbies  .
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Thuds
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PostPosted: Wed Jun 03, 2015 11:17 am Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 Great  job  Andrew  keep  posting  very  informative  and  will  assist  all  wanting  to  switch  to  LED.
 
 Thuds
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Andrew
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PostPosted: Wed Jun 03, 2015 12:59 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
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.
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Andrew
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PostPosted: Wed Jun 03, 2015 1:42 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

                                                   
Rajdeep_Banik  wrote  (View  Post):                
Hi  Andrew,  can  you  help  me  out  a  bit  here.  If  I  want  to  replace  my  tubes  with  LEDs  as  they  are  quite  old  now,  which  colour  will  be  best  for  plant  growth?  I  have  more  than  100Watts  of  light  but  still  there  are  brown  patches  in  the  tank,  the  plant  growth  is  very  low.  My  tank  is  48x18x18  inches.  I  have  read  your  linked  articles,  and  it  shows  that  red  and  blue  light  is  best  for  plants.  So,  if  I  put  mainly  1W  LEDs  of  red  and  blue  in  2:1  ratio,  will  it  be  enough  for  plant  growth?  Also  a  few  10W  LEDs  for  viewing.  What  do  you  suggest?  How  many  LEDs  will  be  needed?  And,  will  the  1W  LEDs  from  ebay  reach  the  bottom  of  the  tank?  
 
 Thanks  in  advance.                

 
 For  your  tank  approx  is  120W  but  i  will  suggest  you  to  go  up  to  160w  for  cob  led  because  we  r  not  using  any  optic  lens,  and  your  plant  mainly  see  the  wavelength  so  the  led  which  i  given  has  630nm  for  red  and  430-450nm  for  blue  and  your  10w  led  already  has  enough  blue  spectrum  so  don't  go  for  too  many  blue,  i  will  add  only  4  blue  and  2  red  for  your  fixture.  6500k  will  give  required  spectrum  so  i  suggest  to  go  with  6500k  itself  but  i  added  10000k  2  leds  with  my  fixture  for  viewing  purpose  only.  some  add  warm  white  and  some  netural  white  so  it's  upto  you  you  can  design  the  light  for  your  pleasure  of  viewing  same  time  your  plants  also  need  proper  spectrum  so  design  accordingly.
 
 And  for  your  brown  patches  it  might  be  lot  of  other  issues,  mostly  it's  light  and  co2  is  the  culprit  which  cause  algae.
 
 basic  formula
 
 10x  flow  of  your  tank  volume
 high  light  -  highco2
 medium  light  -  medium  co2  
 low  light  -  low  co2  if  no  co2  then  choose  plant  accordingly.
 
 when  you  supply  high  light  your  plant  photosynthesis  rate  will  be  high,  and  plant  use  co2  for  photosynthesis  (and  there  are  lot  of  other  stuff  like  chlorophyll  and  all  but  I'm  not  going  to  in  depth  so  will  give  basic  things)  so  when  photosynthesis  happen  high  then  it  requires  high  co2   and  for  to  maintain  it's  health  and  beauty  Chuckle  it  requires  food  also  which  is  your  fert  so  whn  these  are  balanced  then  you  won't  see  any  other  culprit(algae)  in  tank.  but  yes  in  all  tanks  some  kind  of  algae  will  be  there  but  it  in  balance  tank  it  will  be  very  minimal.
 
 main  problems  i  see  in  tank  is  they  will  give  high  light  and  less  co2  and  will  spend  money  in  unwanted  stuff  to  keep  it  balance  always  try  to  keep  tank  balance  in  natural  way  by  adjusting  your  light,co2  and  fert  when  you  master  in  this  you  can  keep  any  size  tank  in  good  shape  so  not  by  fancy  stuff.  for  that  you  need  to  adjust  one  by  one  and  need  to  test  it  for  a  week,  it  might  take  months  but  it's  worth  because  in  future  you  will  become  more  expert.  and  mostly  people  will  do  some  change  and  will  try  to  get  result  in  a  day  or  two  when  they  didn't  see  any  change  and  again  they  will  do  some  other  changes  and  will  spoil  the  tank,  so  when  ever  you  make  some  change  you  need  to  observe  minimum  7-8  days  for  the  result  if  not  then  try  changing  other  things  till  you  see  your  tank  balanced.
 
 when  doing  these  type  of  test  you  need  to  consider  your  tank  temperature  also  because  when  your  tank  temp  is  high  your  co2  presence  will  be  less  when  it's  cool  your  co2  presence  be  high.  for  example  cool  drinks  mainly  cool  drinks  are  carbonated  when  you  open  a  chill  bottle  you  can  see  lot  of  gas  but  in  normal  temperature  bottle  very  less.  And  distribution  plays  a  big  role  too.
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Rajdeep_Banik
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PostPosted: Wed Jun 03, 2015 3:03 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 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?
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kannan_kollam
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PostPosted: Thu Jun 04, 2015 2:00 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 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.                
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bharadwazputta
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Joined: May 30, 2011
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Location: Hyderabad, Telangana, India.

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PostPosted: Fri Jun 05, 2015 1:45 pm Post subject: Re: DIY LED for planted tank(Trial fixture upgrade) Reply with quote

 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?
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