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http://indianaquariumhobbyist.com/community/ :: View topic - How many LEDs for a 39W T5HO
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How many LEDs for a 39W T5HO

 
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abhishekls
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PostPosted: Tue Aug 21, 2012 1:23 am Post subject: How many LEDs for a 39W T5HO Reply with quote

 How  many  LEDs  will  I  need  to  replace  my  current  4  X  39  watt  T5HO  lights.
 
 Also  which  LEDs  are  advisable  to  buy  ?
 
 Lastly,  are  LEDs  good  for  planted  tanks,  or  they  are  hit  n  miss  with  respect  to  spectrum  ?
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Nidhi
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PostPosted: Tue Aug 21, 2012 9:45 am Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 Abhi,
   
 How  many  LEDs  will  I  need  to  replace  my  current  4  X  39  watt  T5HO  lights.
 you  cant  compare  LED  with  Other  lights,  if  your  tank  is  36x18x18  then  12  nos  or  if  48x18x18  then  16  nos  of  cool  day  light  cree  LED  will  do..  each  will  consume  around  5W  of  power  when  driven  to  the  max  of  the  specified  current.
 
 Also  which  LEDs  are  advisable  to  buy  ?  
 These  are  the  ones  sold  on  Rapid  led  for  planted  tanks..  in  DIY  KITS.
 1.CREE  XP-G  R5  5W  Cool  White  LED
 2.Philips  Rebel  ES  Cool  White  LED
 
 Lastly,  are  LEDs  good  for  planted  tanks,  or  they  are  hit  n  miss  with  respect  to  spectrum  ?
 They  are  working  I  hope,  since  most  of  them  are  referring  to  Rapid  led..  
 They  are  of  cool  day  light  color.  equable  to  865  of  Tubes..
 
 Or  if  wanna  go  for  Chinese  LED,  then  1W  LED  x  70-75  nos  for  3  feeter  and  90-100  if  4  feeter.
 If  going  for  3W  LED,  then  35-40  of  these  on  3  feeter  and  around  50  for  4  feeter..
 
 Since  even  I  wanted  to  do  a  DIY  on  this  ,  I  calculated  ¬†after  going  through  many  articles  on  line..  and  ended  up  on  this..
 
 I  would  like  to  hear  more  from  others..
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josyjames
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PostPosted: Tue Aug 21, 2012 11:42 am Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

                                                   
Nidhi  wrote  (View  Post):                
if  your  tank  is  36x18x18  then  12  nos  or  if  48x18x18  then  16  nos  of  cool  day  light  cree  LED  will  do..                  

 
 @  Nidhi,  I  should  say  that  12  nos  of  Cree  would  not  be  sufficient  for  a  36x18x18  tank.  On  what  basis  had  you  reached  to  the  conclusion  of  having  12  nos  for  a  35x18x18  tank?
 
 I  would  say  that  you  need  more  for  the  above  tank  dimension.  Also  you  need  to  choose  the  right  optics  depending  upon  the  tank  dimension.  You  could  still  do  away  with  12  nos.  If  you  have  chosen  proper  optics,  you  can  cover  the  entire  surface  area  of  a  36x18x18  tank.  But  you  would  have  less  intensity  when  using  less  number  of  led's.  The  PAR  value  would  be  on  lesser  side  when  using  less  number  of  led's  to  cover  a  larger  surface  area.
 
 @  abhishekls,
 
 You  cannot  compare  the  number  of  led's  equivalent  to  any  other  lights.  When  it  comes  to  led's,  generally  the  number  of  led's  are  chosen  based  on  the  tank  surface  area  and  tank  depth.  I  use  9  led's  for  a  12"  cube  surface  area.  So  based  on  the  surface  area  of  your  tank,  you  need  to  calculate  the  number  of  led's  required.  9  led's  for  12"  cube  -  The  number  of  led's  would  reduce  if  you  are  choosing  Cree.  As  Cree  led's  have  higher  lumens  output  while  comparing  to  other  led's.
 
 Hence  higher  the  lumens  output,  lesser  the  number  of  led's  to  be  used  in  a  setup.
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Nidhi
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PostPosted: Tue Aug 21, 2012 12:03 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 @  shellly,
 Cree  or  the  Phillips  can  be  driven  at  approximately  5  times  the  Regular  1W  LED,  means  that  each  will  be  delivering  around  close  to  460  lumens  at  5W..  so  12  X  460  =  5520  Lumens..
 which  comes  to  around  the  same  as  my  present  45X2  HO  CFL..  
 And,  yes  optics  must  be  used..  depending  upon  the  height  of  the  mount..  
 But  as  I  said,  It's  just  my  theoretical  calculation..
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abhishekls
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PostPosted: Tue Aug 21, 2012 12:15 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 Thank  you  for  the  information  guys
 
 @shelly
 
 As  per  your  calculations,  I  would  need  around  42  Leds  to  cover  my  tank.
 If  I  use  it  should  come  down  to  36  ?
 
 However,  I  noticed  you  did  not  mention  if  it  was  a  3w  LED  or  1  W  LED
 
 if  I  use  3W  will  it  significantly  come  down
 
 @Nidhi
 I  think  as  per  my  reading  too  your  Lumen  calculations  seem  to  be  correct.
 But  I  had  a  question  and  that  is,  how  high  should  the  LEDs  be  hung  to  cover  the  entire  surface  area.
 Also,  I  am  not  able  to  get  the  correct  kelvin  ratings  also  of  Cree  LEDs  or  the  ones  available  here.
 Any  idea  which  ones  would  be  closer  to  6.5k-8k  range  ?
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Nidhi
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PostPosted: Tue Aug 21, 2012 12:36 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 Abhishek,
 The  Cree  I  have  mentioned  is  around  5000  to  8300  K  and  the  Phillips  says  4500-10000K  color  temperature  (5650K  typical)  ,  they  never  give  the  exact  kelvin..  as  most  manufacturers.
 They  generally  term  it  as  Warm  day  light,  neutral  white,  cool  day  light  etc..  we  need  to  buy  the  cool  day  light..  
 The  height  seems  to  depend  on  the  optics  we  use  like  40,  60  or  80  degrees..  with  40  deg  you  can  fit  it  higher  and  80  means  a  bit  closer,  may  be  like  6  inches  from  the  water  level.
 If  you  don't  go  for  the  optics  then  you  will  loose  some  of  the  precious  lumens..  
 Where  as  the  Chinese  make  LED  will  be  having  a  term  like  ultra  cool  day  light..  and  may  be  like  6-8K  rating.
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josyjames
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PostPosted: Tue Aug 21, 2012 1:01 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 @  Abhishek,
 
 The  height  at  which  you  want  to  keep  the  hood  entirely  depends  on  the  optics  used.  Nidhi  had  already  mentioned  it.
 
 
 
 In  the  above  hood,  I  have  not  used  any  optics.  The  viewing  angle  of  the  led  is  140  Deg.  Since  I  have  not  used  any  optics,  you  can  notice  that  the  lights  are  actually  falling  outside  the  tank.  So  if  you  don't  use  optics,  you  would  be  wasting  the  light.  
 
 So  better  choose  the  optics  depending  upon  the  hood  that  you  are  going  to  make.  If  you  are  planning  to  have  the  hood  which  is  sitting  on  top  of  the  tank,  say  the  hood  would  be  sitting  4-5"  above  the  water  surface,  choose  wider  optics.
 
 And  if  you  are  planning  to  hang  the  hood  from  the  top,  then  choose  the  lower  optics.  You  can  even  hang  the  hood  from  the  ceiling  of  the  room  if  you  have  the  right  optics.  
 
 
 
 The  above  hood  is  sitting  on  top  of  the  tank.  Hence  I  have  chosen  60  deg  optics.
 
 
 
 This  hood  is  hanged  from  the  ceiling  and  the  optics  chosen  is  45  deg.
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PostPosted: Tue Aug 21, 2012 1:05 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 I  use  only  3-5  Watts  LED's  since  with  higher  wattage  led's  the  options  for  optics  is  very  very  less.  So  if  no  optics,  you  have  lesser  control  on  light  penetration  to  cover  the  surface  area  of  the  tank.
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abhishekls
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PostPosted: Tue Aug 21, 2012 2:24 pm Post subject: Re: How many LEDs for a 39W T5HO Reply with quote

 This  is  real  good  information  @shelly  and  @Nidhi
 
 I  will  try  to  get  the  raw  materials  and  update  about  the  progress.
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