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http://indianaquariumhobbyist.com/community/ :: View topic - How often should I replace my lights
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How often should I replace my lights

 
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robero
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PostPosted: Tue Dec 04, 2012 11:23 pm Post subject: How often should I replace my lights Reply with quote

 Hi  guys,
 
 After  one   whole  year  I  am  finally  getting  back  to  planted  tank  (again)   Agree  ..  I  was  using  2  36W  phillips  PLL  for   about  a  year  now.  Should  I  consider  replacing  the  lights  or  would  they  do  fine  untill  they  burn  out?  Am  I  expecting  a  shift  of  spectrum  or  a  reduction  in  total  output?
 
 Any  help  on  this  regard  will  be  appreciated.  Thanks  in  advance.
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nanomania
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PostPosted: Wed Dec 05, 2012 12:27 am Post subject: Re: How often should I replace my lights Reply with quote

 if  u  going  for  moss  and  fern  tank,  you  dont  need  to  change....
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Mortis
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PostPosted: Wed Dec 05, 2012 1:11 am Post subject: Re: How often should I replace my lights Reply with quote

 Dont  worry  about  it,  change  them  only  when  the  bulbs  go   Thumb Up
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robero
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PostPosted: Wed Dec 05, 2012 9:26 am Post subject: Re: How often should I replace my lights Reply with quote

 ok..  I  am  really  confused  right  now.
 @Mortis.  Can  you  tell  me  more?  Are  you  keeping  planted  tanks?  
 Since  you  are  saying  this  I  am  thinking  you  have  had  success  with  planted  tanks  without  replacing  the  light  untill  they  burn  out.
 In  that  case  I  would  follow  your  advice  and  keep  the  lights.
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Mortis
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PostPosted: Thu Dec 06, 2012 12:02 am Post subject: Re: How often should I replace my lights Reply with quote

 Yes  I  am  into  planted  tanks  and  in  the  current  fixtures  I  am  using  I  only  changed  the  tubes  after  2.5  years  and  that  too  just  for  kicks  because  I  was  shifting  it  onto  a  new  tank  and  I  wanted  to  see  what  the  6500k  tubes  from  various  companies  looked  like  otherwise  I  would  have  run  them  till  they  had  stopped  working
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robero
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PostPosted: Thu Dec 06, 2012 9:10 am Post subject: Re: How often should I replace my lights Reply with quote

 Thanks  for  the  input  buddy.  From  some  sources  in  the  net  it  is  recommended  to  replace  the  lights  every  6  months  while  others  recommend  keeping  them  untill  they  burn  out  which  rendered  me  confused.  So  I  was  looking  for  advice  from  someone  who  had  practical  experience  in  this  area.
 
 Replacing  lights  every  6  months  is  a  utter  waste  of  money..
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superbsite
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PostPosted: Thu Dec 06, 2012 11:22 am Post subject: Re: How often should I replace my lights Reply with quote

 This  is  really  a  debatable  topic  as  most  users  in  some  forums  recommend  to  replace  lights.  
 
 Why  spend  the  money  unnecessary  ?
 
 I've  changed  my  lights  only  after  they've  burned  out.
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Linelogic
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PostPosted: Thu Dec 06, 2012 11:41 am Post subject: Re: How often should I replace my lights Reply with quote

 I  kinda  tilt  towards  Mortis'  and  Pio's  thinking...........  I've  been  using  the  same  36W  PLL's  in  my  planted  tanks  for  about  2+  years  now.  Have  not  noticed  any  significant  difference  in  the  plant  growth  due  to  the  same  tubes  being  used  for  a  long  time.
 Even  I  feel  changing  the  tubes  every  6  months  or  1  year  is  a  real  waste  of  money.  You  cannot  even  use  the  old  tube  for  your  home  lighting......   Very Happy  Ha  ha  ha.......  Unless  you  have  a  shop  which  has  similar  36W  industrial  lighting.
 
 Regards
 Prabhu
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saikumar
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PostPosted: Thu Dec 06, 2012 12:27 pm Post subject: Re: How often should I replace my lights Reply with quote

 Same  pinch.  Even  I  am  in  your  shoes  guys,  hope  someone  helps  us  on  this.
 But  I  dont  trust  eye,  because  any  bright  thing  would  look  bright.  A  comparitive  check  may  be  better.
 
 
 
 And  this  is  what  I  am  learning  now,  wish  some  one  helps  to  conclude  it.
 
 The  lamp  says  8000hrs  of  life  or  more
 http://www.cp-lighting.co.uk/DULUX-L-36W-860-2G11
 Then  again,  the  intensity  decreases  by  time,so  I  wouldnt  want  to  run  anything  thats  died  out  70%(  I  am  a  B-grader  Sad)
 
 
 Check  the  Rated  LLMF  in  below  link  and  I  wouldnt  want  it  to  decrease  much,  but  howmuch?  I  dont  know.
 
 http://www.osram.com/osram_com/products/lamps/compact-fluorescent-lamps/osram-dulux-l/osram-dulux-l-lumilux/index.jsp?search_result=%2fosram_com%2fsearch%2fadvanced_search.jsp%3faction%3ddosearch%26inp_searchterm_1%3ddulux%2b36%26website_name%3dosram_com&productId=ZMP_58922
 
 
 Quote  from  site
 
                                                 
Quote:                
Technical  data
 Expand  Electrical  data  Nominal  wattage  36  W   
 Rated  lamp  efficacy  (standard  condition)  77  lm/W   
 Rated  wattage  36  W   
 
 Light  technical  data  Color  rendering  index  Ra  80…89   
 Rated  luminous  flux  2750  lm   
 Luminous  flux  at  25  °C  2750  lm   
 Light  color  865   
 Color  temperature  6500  K   
 Nominal  luminous  flux  2750  lm   
 Rated  LLMF  at  2,000  h  0.84   
 Rated  LLMF  at  4,000  h  0.81   
 Rated  LLMF  at  6,000  h  0.79   
 Rated  LLMF  at  8,000  h  0.77   
 Rated  LLMF  at  12,000  h  0.76   
 Rated  LLMF  at  16,000  h  0.73   
 Rated  LLMF  at  20,000  h  0.72   
 Luminance  2.8  cd/cm²   
                 

 
 
 After  that  calculate  as  below  where  we  stand  and  then  decide
 http://personal.cityu.edu.hk/~bsapplec/lumen.htm
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Mortis
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PostPosted: Thu Dec 06, 2012 2:06 pm Post subject: Re: How often should I replace my lights Reply with quote

 The  drop  in  PAR  and  shift  in  spectrum  over  the  life  is  barely  10%  so  its  not  like  you  will  go  from  10W  to  5W
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superbsite
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PostPosted: Thu Dec 06, 2012 3:05 pm Post subject: Re: How often should I replace my lights Reply with quote

 All  the  lights  usually  mention  how  long  they  should  last  for  and  Mortis  is  right  in  saying  that  the  decrease  is  minimal.
 
 LFS  will  always  tell  you  to  change  your  lights  because  they  want  more  business
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saikumar
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PostPosted: Thu Dec 06, 2012 3:24 pm Post subject: Re: How often should I replace my lights Reply with quote

 Thats  cool  then,  I  ll  keep  what  I  have  Thumb Up  and  change  if  plants  arent  responding  well,  may  be  a  better  way.
 Agree  with  you  Mortis,  it  might  be  very  minimal,  I  think  Trevor  ran  his  tank  for  2yr+  with  philips  trulite  and  he  grew  most  of  the  plants  of  hobby.
 
 
 May  be  we  people  just  want  a  reason  to  buy  new  stuff.  Sad
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robero
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PostPosted: Thu Dec 06, 2012 3:55 pm Post subject: Re: How often should I replace my lights Reply with quote

 Thank  you  all  for  your  comments.  It  seems  a  myth  has  been  busted.   :cheering:
 
   I  would  continue  to  use  the  PLLs  and  see  how  much  plant  thrives.
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