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http://indianaquariumhobbyist.com/community/ :: View topic - 3 W x 4 LED running on 12V 5A adopter
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3 W x 4 LED running on 12V 5A adopter

 
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radjanair
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PostPosted: Sat Dec 01, 2012 10:55 pm Post subject: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 Hi,
 Can  I  use  3W  x  4  LED  on  12V  5A  adopter.
 Please  help  me.
 regards
 radjanair
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Minnu
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PostPosted: Sun Dec 02, 2012 12:36 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 Nope,  Its  not  possible  to  Run  3  W  *  4  LED  on  a  12V  5  A  driver.
 
 Each  3  W  LED  run  on  current  of  700  MA  and  if  you  connect  them  5  A  driver  they  would  for  sure  get  burned  of.
 
 Each  of  your  3  Watt  LED  run's  in  3-3.5  V  and  if  you  connect  them  in  series  they  would  use  the  12  V  but  the  current  suplied  on  this  series  in  5  A.  You  would  require  additional  6  more  much  parallel  connection.
 
 Do  refer  the  below  link  it  would  give  you  useful  information  about  wiring  your  LED.
 
 http://led.linear1.org/led.wiz
 
 Regards
 Praveesh
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radjanair
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PostPosted: Sun Dec 02, 2012 9:23 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 Hi,  Praveesh
 Thank  You.     I  am  now  using  it  for  a  month.   Nothing  happened.   If  I  add  another  6  more  3w*4  leds  in  parellel,   will  the  power  supply  adopter  12v  5A  get  heat.   Please  help.
 If  I  use  totally  28  leds  like  this,  how  many   white  and  blue  I  can  use  for  my  aquarium.   My  Aquarium  size  is  31"(L)  x  15"(W)  x  17"  (H)  for  planted  tanks.  
 radjanair
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saikumar
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PostPosted: Sun Dec 02, 2012 9:44 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 Praveesh,  wouldnt  the  LEDs  short  the  powersupply  because  of  the  very  low  resistance?
 
 Rajan,  you  ll  need  atleast  2/3rd  of  what  you'd  have  used  with  normal  fluroscent  lights,  with  the  point  of  LEDs  being  30%  better.  Now  next  question  to  you  is-  are  your  LEDs  30%  better  than  the  fluroscents?
 
 EDIT:  I  went  through  your  posts,  and  realized  what  you  have  is  a  5A  is  a  driver  not  mere  SMPS.  So  you  should  be  good  if  you  use  up  all  12V  X5A,  i.e.  Appx  60W,  meaning
 4  LEDs  per  string(~12V/3.6V)  X  6  strings  (5A/0.75A).  And  as  suggested  by  a  few  using  to  run  just  a  couple  might  damage  the  LEDs.
 Had  you  provided  the  parameter  LUMENS  per  each  LED  we  could  calculate  how  many  LEDs  you  ll  need  for  the  tank.
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marlon12
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PostPosted: Mon Jan 14, 2013 9:48 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 hey  Rajan  
 have  you  succeeded  in  your  quest  of  increasing  the  no  of  LEDS  
 
 would  like  to  know  as  me  also  planning  to  switch  to  LED  lighting  for  my  aquarium  
 
 
 marlon
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radjanair
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PostPosted: Mon Jan 14, 2013 11:33 am Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 @saikumar
 the  details  of  the  led
 3W  -  700ma  -  3.6/3.8V     182-200Lum     (white)
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raghavarao
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PostPosted: Mon Jan 14, 2013 1:26 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 it  is  ok  to  run  4  leds  in  series,  your  power  supply  is  12V  5A  so  only  3V  will  taken  for  each  LED  with  appropriate  resistor  in  series.
 
 You  can  run  up  to  8  series  in   parallel.
 if  your  led  gives  700mA  when  supply  is  3.6V  each  led
 then  for  3V  it  will  be  less  current.
 
 ok  one  series  willbe  700mA  ie  0.7mA
 
 then  example  6  series  X  0.7mA  =  4.2A  is  the  total  current  consumtion.  0.8A  is  for  buffer.
 
 Be  Safe    if  any  one  resistor  burnts  in  series  the  all  LEDs  will  fire.  Use  FUSE  about  0.8A  in  all  series  for  safety.
 
 Rao
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radjanair
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PostPosted: Mon Jan 14, 2013 1:57 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 @marlon12  
 not  yet  now.   I  am  out  of  station.
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radjanair
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PostPosted: Mon Jan 14, 2013 1:58 pm Post subject: Re: 3 W x 4 LED running on 12V 5A adopter Reply with quote

 Can  anyone  suggest,  how  many   white  and  blue  I  can  use  for  my  aquarium.   My  Aquarium  size  is  31"(L)  x  15"(W)  x  17"  (H)  for  planted  tanks.
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