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http://indianaquariumhobbyist.com/community/ :: View topic - DIY 100x3w LED hood (Need some HELP).
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DIY 100x3w LED hood (Need some HELP).
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bhumin
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PostPosted: Fri Jan 11, 2013 5:41 pm Post subject: DIY 100x3w LED hood (Need some HELP). Reply with quote

 hello  all  IAH  members,  m  so  excited  about  this  LED  project  &  would  like  to  have  some  input  from  you  all  guys.  so  my  LEDs  specifications  are  as  below.
 
 LED=  3w  Chinese
 Forward  Voltage(V)  =  3.5v
 MAX  Amp  =  700mA
 LuMen  =  170  (Aprox)
 wavelength  =  6K-6.5K
 below  is  my  LED  pic.
 
 
 also  have  a  DC48v  10A  Power  supply  driver  for  this  setup.  since  m  not  good  with  electronic  subject  i  have  done  some  basic  meths  &  found  i  can  run  13  Leds  in  series  with  700mA.  same  way  i  can  run  8  strips  of  13leds  in  parallel,  (right?).  for  same  i  have  below  sample  diagram  for  my  LED  hood.
 
 
 
 now  a  big  problem  arise  when  some  one  suggest  me  to  use  a  RESISTOR  on  each  strip  and  didnt  precisely  tell  me  what  type  of  resistor  &  what  ohms.Surprised  i  doubt  that  this  resistor  thing  might  be  important  &  could  be  useful  with  my  led  setup.  so  again  i  did  some  research  on  it  &  found  below.
 
 
 
 oops..i  really  dont  understand  above  diagram  at  all.  and  found  my  self  so  confused.  Surprised   Help  
 
 now  i  have  below  questions  to  be  answered,  so  please  help  me  masters  of  electronics/Leds.
 
 1)  is  my  diagram  for  13X3Wled  series  with  8  parallel  meth  is  right?
 2)  is  my  DC  48V  10A  Driver  Conf.  is  right?
 3)  Do  i  really  need  RESISTOR?  if  yes  then  what  type  ?  &  are  those  resistors  easily  available  in  market?
 4)  what  if  i  go  for  setup  without  RESISTOR  ?   :?
 
 currently  above  are  the  most  confusing  question  for  me  to  start  my  setup.  
 
 secondly  i  have  to  mention  that  my  tank  is  4X2X1.8  currently  having  7x36v  CFL  with  lots  of  heat  (due  close  hood),  3-4bps  Co2,  EI  dosing.  external  2500L/h  filter.  
 
 Please  help  me  guys.  thanks  in  advance.
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saikumar
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PostPosted: Fri Jan 11, 2013 5:52 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Firstly,  except  heat  management  you  ll  not  be  gaining  anything  much  from  this  setup.  CFL  gives  around  70lumens  per  watt,  your  setup  is  170/3=63.3lm/W
 
 
 1)  is  my  diagram  for  13X3Wled  series  with  8  parallel  meth  is  right?  yes
 2)  is  my  DC  48V  10A  Driver  Conf.  is  right?  yes,  but  there  is  difference  between  powersupply  and  "DRIVER".
 3)  Do  i  really  need  RESISTOR?  if  yes  then  what  type  ?  &  are  those  resistors  easily  available  in  market?-  you  dont  need  when  you  use  driver.  And  a  power  eating  element  is  always  a  bad  circuit,  so  avoid  it.
 4)  what  if  i  go  for  setup  without  RESISTOR  ?   Confused  -  Simple!  you  ll  need  a  driver(Clue-  forget  resistors,  read  on  DRIVERS.
 
 secondly  i  have  to  mention  that  my  tank  is  4X2X1.8  currently  having  7x36v  CFL  with  lots  of  heat  (due  close  hood),  3-4bps  Co2,  EI  dosing.  external  2500L/h  filter.  
 300W  of  LED  :O  on  this  small  tank,  you  ll  need  to  up  somany  things  and  may  be  even  tank  size.
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syed
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PostPosted: Fri Jan 11, 2013 5:54 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 try  this  site
 
 http://ledcalc.com/
 
 Resistor  are  available,  avoid  using  them,  if  you  do  want  to  use  then  use  the  source  such  that  you  have  to  use  min  value  resistor.
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bhumin
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PostPosted: Fri Jan 11, 2013 7:18 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 saikumar,  thanks  for  info.  
 
 as  u  said  Powersupply  or  Driver  then  i  m  bit  sure  that  the  DC  supply  i  have  is  DRIVER  &  specification  for  same  (driver)  is  as  below.  kindly  have  a  look  on  it  and  please  conform  that  this  is  a  DRIVER  or  not.
 
 48V10A  Switch  Power  Supply  Driver
 
    Size:  24  x  12.3  x  6.5cm
     Shell  Material:  Metal  case  /  Aluminum  base
     Input  Voltage:  176-264V
     Output  Voltage:  48V  DC
     Output  Current:  0~10.0A
     High  efficiency,  high  reliability,  low  cost.
     High  480W  power  to  fit  more  devices.
     Wide  range  of  input  voltage  support,  176V-264V  input  votage  are  available(Adjusted  By  Switch).
     Adjustable  approx  40-52VDC  Output  Voltage  support.
     PWM  control  and  regulation,  insure  the  steady  and  precise  output  voltage.
     Built-in  Big  Fans  for  forced  air  cooling.
     Built-in  EMI  filter.
     100%  full  load  burn-in  test.
     Over  current,  over  voltage,  short  circuit  and  overheat  protections.
     Low  output  ripple  and  yawp.
     Widely  used  in  Industrial  automation,  LED  display,  communications,  etc.
     Safety  Compliance:  CCC/  FCC  /  CE
     

 
 secondly,  i  will  have  switches  on  each  circuit  so  if  found  too  much  light  some  strips  can  be  shutoff.  also  please  tell  me  that  above  Driver/Posersupply  is  controllable  or  not..
 
 @syed
 
 i  tried  that  web-calc  for  resistor  but  it  says  your  DC  voltage  is  our  of  their  scope.  they  really  dont  know  48VDC  Surprised  Sad  
 
 thanks
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radjanair
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PostPosted: Fri Jan 11, 2013 7:29 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Hi
 All  the  Best  for  your  project.
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josyjames
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PostPosted: Fri Jan 11, 2013 7:50 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 @  Bhumin,
 
 It  is  not  an  LED  driver.  It  is  just  a  power  supply.  LED  driver  is  different  from  a  power  supply.  LED  driver  is  something  that  gives  you  steady  current  output  rather  than  a  steady  voltage  output.
 
 Remember  that  LED  is  a  current  driven  electronic  equipment.  So  it  needs  steady  current  to  drive  it  properly.  Unsteady  current  would  conk  off  the  led  soon/would  reduce  the  life  span  of  the  led.
 
 There  are  lots  of  ready  made  driver  available  in  the  market/ebay/online.  You  can  choose  the  one  which  serves  your  purpose.
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raghavarao
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PostPosted: Fri Jan 11, 2013 9:08 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Can  use  LM317  chip  -  constant  current  
 
 LM317  takes  3v
 13  led  takes  3.5v  
 total  48v/13led  plus  one  LM317  chip
 you  can  calculate  your  resistor  by  your  current  need  
 R=1.25/current
 
 Regards
 Rao
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bhumin
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PostPosted: Sat Jan 12, 2013 8:04 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 @  Shelly  
 
 thanks  for  your  input,..  as  per  your  note  it  has  been  little  bit  clear  to  me  that  i  require  700mA  constant  current  then  10A  for  whole  setup.  in  other  words  i  have  to  regulate  the  current  not  voltage.  
 
 secondly,  i  already  invested  some  $$$$  in  48VDC  P.S  (as  i  dont  know  about  the  CURRENT  thing)  buying  another  driver(s)  would  cost  me  alot.  so  i  might  stick  with  48V  unless  it  appear  to  be  totally  useless  with  what  m  planning.
 
 so  now  second  option  suggested  by  "raghavarao"  looks  promising  to  me  &  have  done  some  research  on  LM317.  found  it  very  simple  &  efficient  with  this  type  of  LED  setup.  also  done  some  very  basic  simple  calculation  &  found  i  can  use  1.8  ohm  resistor  with  LM317.
 
 "raghavarao"  now  again  some  complications  are  there  for  me  that  1)  do  resistors  comes  with  particular  W  output  or  just  simple  1.8  ohms  i  need  to  us?  2)  in  LM317  data  sheet  it  says  that  40V  input  voltage  is  MAX  then  how  to  control  my  48V  output  from  P.S.?  also  please  look  at  my  Power-Supply  specification  in  previous  post..  it  mention  that  it  has  PWM  ,  what  is  it?  &  can  it  control  my  voltage  to  40V.
 
 if  PWM  is  not  enough  to  control  my  output  to  <=40V  ,  is  there  any  option  to  control  that?
 
 below  is  the  LM317  diagram.
 [b]
 
 thanks  all  for  help..  Smile  i  can  do  it..  Thumb Up
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bhumin
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PostPosted: Sat Jan 12, 2013 8:07 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

                                                   
radjanair  wrote  (View  Post):                
Hi
 All  the  Best  for  your  project.                

 
 thanks..  hope  for  the  best..  Smile
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saikumar
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PostPosted: Sat Jan 12, 2013 8:55 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 I  suppose  40  is  max.  You  could  well  use  two  LM317  in  parallel,  so  24V  on  each.
 PWM  of  supply  is  just  a  parameter,  can't  use  to  control  it.
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bhumin
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PostPosted: Sat Jan 12, 2013 9:08 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 2XLM317  will  parallel  to  one  series  of  LED??     Confused  
 as  i  already  mentioned  that  there  will  be  13Led  series  with  8  strips  in  paralle..  and  as  per  LM317  datasheet  i  have  to  us  separate  IC  for  each  strip.  
 
 so  it  will  be  8x  LM317  which  is  48/8=6V  Confused  then  how  to  drive  13Leds  with  6V  
 
 m  totally  confused........ConfusedWall Bang
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jerin111111
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PostPosted: Sat Jan 12, 2013 10:12 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 bro  please  be  careful,  as  you  might  run  into  serious  heat  issues,
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PostPosted: Sat Jan 12, 2013 10:48 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Ok  for  your  Power  supply  you  can  use  LM317HVT   this  is  upto  60V  and  1.5A  (  check  in  the  shop)
 
 You  are  confusing  with  voltage  and  current  (  48V  is  your  supply  voltage  and  10A  is  max  load  current  upto  which  it  can  take)
 
 ok  now  you  have  8  set  of  13leds  in  series  connected  in  parallel
 
 then  one   led  series  takes  only  0.7A
 
 total  circuit  current   8X0.7A=  5.6A  is  your  total  led  current  taken.  And  you  have  10A.
 
 Now  You  Have  3W  chinese  LED  of  about  100  nos  and  it  should  be  very  huge  brightness.  Chinese  LED  give  very  high  HEAT  when  running  at  700mA.
 
 for  safer  side  reduse  the  current  and  use  Optics.
 
 Rao
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jitu613
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PostPosted: Sat Jan 12, 2013 11:47 pm Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Bumin@
 Contect  KV  Lighting,near  SBI  Bank  timaliyawad,Nanpura.
 they  manufactur  all  type  LED  based  light.  You  can  ask  them  for  guidance.
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saikumar
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PostPosted: Sun Jan 13, 2013 12:43 am Post subject: Re: DIY 100x3w LED hood (Need some HELP). Reply with quote

 Now,  take  the  words  of  Mr.  Rao  very  seriously.  You  calculate  the  losses  and  you  ll  be  enough  scared  that  you  ll  now  start  looking  for  heatsink  cooling  system  for  your  total  rig.
 
 13  leds,  and  each  at  3.4V,  i.e  ~  44V
 Assume  you  are  in  limits  of  SMPS  and  next  4V(2.5  for  LM317  not  sure  of  HVT,  should  be  more  +  1.25  for  reference)  goes  in  losses  or  resistor  and  heat  up.
 
 Now  the  power  consumption  just  for  losses,  4V  X  5.6A=  22W!!!  Shocked  of  just  single  IC,  thats  why  linear  electronics  is  much  avoided.
 You  have  invested  so  much  ?"?"?"?",  dont  burn  it  off,  wait  a  while  get  some  dependable  stuff  before  you  fire  them  up.
 
 (edit:  incase  you  havent  gone  through  this  page,  might  help  http://theparanoidtroll.com/electronics/primers-and-tutorials/other/constant-current-sourceload-lm317/)
 
 Good  luck...
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