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http://indianaquariumhobbyist.com/community/ :: View topic - Light and Photosynthesis
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Light and Photosynthesis

 
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puneit
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PostPosted: Tue Apr 05, 2005 11:39 am Post subject: Light and Photosynthesis Reply with quote

 Hi,  
 We  all  know  that  light  is  needed  for  photosynthesis,  and  while  creating  an  artificial  ecosystem,  we  try  our  best  to  mimic  the  nature;  sometimes  we  even  go  one  step  further,  by  providing  the  best  conditions  for  a  particular  organism  of  interest.
 I  have  recently  started  growing  aquatic  plants  in  my  aquariums,  and  now  I  am  stuck  to  what  kind  of  light  I  should  use.  
 Earlier  I  was  using  CFLs  of  gloden  yellow  glow,  but  then  changed  them  with  cool  whites  after  getting  suggestions  from  A-S-K.
 
 I  refreshed  school  biology  on  the  internet  and  found  that  photosynthesis  is  maximum  at  430  and  662  nm.  http://www.botany.uwc.ac.za/ecotree/photosynthesis/spectrum.htm
 See  the  graph  on  this  website.  
 Also  surfed  through  thekrib,  learned  that  pink  light  does  have  some  good  effects  on  photosynthesis.  
 Now  my  query  is,  Is  it  wattage  or  specturm  that  enhances  plant  growth  or  both?  I  understand  that  wattage(  which  in  anycase  refers  to  lumens)  will  decide  till  what  depth,  light    penetrates  in  water,  for  which  there  is  a  thumb  rule  as  to  so  many  watts  per  gal  of  water.
 Increasing  brightness  beyond  that  value,  does  not  only  increse  heat  but  also  lightens  the  weight  from  our  pockets(electricity  consumption  is  more  Wink  )
 To  achieve  this,  is  not  a  diffiicult  task.  What  is  difficult  for  me  is,  to  attain  the  right  specturm.  Is  golden  yellow,  a  no  no  for  sure?  Is  white  light  good  enough(  i  feel  not,  please  tell  me  if  i  am  wrong).  
 Has  anyone  tried  Pink  light(Pink  light  CFLs  are  available;  found  that  yesteterday  only)
 How  about  a  combination  of  Pink  and  yellow.
 According  to  specturm  of  visible  light,  pink  should  approximately  fall  near  to  430nm  and  golden  yellow  (CFL)  should  cover  662  nm.
 Apart  from  these,  CO2  injection  is  also  required,  for  which  I  have  put  DIY  CO2  yeast  reactor  with  no  CO2diffuser;;  only  an  airstone.  My  aquariums  also  have  spray  bar,  which  increase  agitation,  i  agree,  but  I  am  sure  it  also  increases  CO2  pumping  from  atmosphere.
 
 I  am  yet  to  see  pearling,  though  Hornworth(Ceratophyllum)  is  growing,  as  I  have  seen  new  leaves  coming  and  a  branch  is  also  growing!
 
 I  learnt  that  pearling  occurs  when  there  is  saturation  of  O2  in  water.  Saturation  will  never  take  place  in  moving  water(spray  bar  system),  am  I  right?    Has  anyone  experienced  pearling  with  spray  bars  or  agitatted  water?
 
 _____________________________________________________________
 
 Puneit
 Please  give  your  valuable  suggestions  and  experiences
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Madan
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PostPosted: Tue Apr 05, 2005 11:58 am Post subject:  Reply with quote

 White  Light,  yellow  light,  Pink  Light  ....  are  all  subject  to  one's  perceptions.  Color  temparature  is  the  only  accurate  thing  when  it  comes  to  comparing  light.  Any  light  from  5000K  to  6500  K  should  be  good  enough.
 
 Go  for  triphosphor  lamps  (  Phillips  Tru  light  6500K)  and  you'll  have  the  entire  spectrum  you  need.  No  need  to  mix  and  match.
 
 Increased  agitation  will  drive  out  CO2  from  the  water  and  not  "drive  -  in  CO2".
 
 
                                                 
Quote:                
Saturation  will  never  take  place  in  moving  water(spray  bar  system),  am  I  right?  Has  anyone  experienced  pearling  with  spray  bars  or  agitatted  water?
                 

 
 Yes  I  have.  
 
 Check  out  this  section  of  the  Krib:
 
 http://www.thekrib.com/Plants/Tech/
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puneit
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PostPosted: Tue Apr 05, 2005 12:13 pm Post subject:  Reply with quote

 Whats  the  cost  of  this  Phillips  Tru  light  6500K?  Can  it  fit  in  normal  Bulb  holders  or    I  will  have  to  change.  Whats  the  wattage  of  it?
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Madan
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PostPosted: Tue Apr 05, 2005 12:17 pm Post subject:  Reply with quote

 The  tubes  cost  Rs.  90/-  or  there  abouts.  They  come  in  2  feet  and  4  feet  sizes.  20  watts  and  40  watts.  They  can  be  fitted  to  normal  tube  light  holders.
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sen
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PostPosted: Tue Apr 05, 2005 3:08 pm Post subject:  Reply with quote

 Madan,
 I  use  four  18  W  CFL's  plus  two  20  W  tubes  for  my  40  Gallon  tank.
 all  are  6500K  (Cool  day  light).
 Should  I  change  few  CFL's  to  warm  day  light  (Not  sure  abt  the  kelvin)  ones  ?
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Madan
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PostPosted: Tue Apr 05, 2005 5:41 pm Post subject:  Reply with quote

 You  have  more  than  enough  light  for  a  40  gallon.
 
 Warm  Daylight  bulbs  typically  have  a  temparature  of  2700  K.
 
 Daylight  as  from  the  sun  at  mid  day  in  the  Tropics  has  a  color  temparature  of  about  5300K.
 
 The  Cooler  the  Bulb  is  rated  the  Higher  the  Color  Temparature.
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madhu_ulysses
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PostPosted: Tue Apr 05, 2005 7:36 pm Post subject:  Reply with quote

 Whats  the  difference  between  Philips  trulite  and  aquarium  lights  assuming  wattage  and  hence  the  K  Value  are  constant  for  both?
 Also  i've  seen  aquarium  lamps  in  3  colours  viz.,  pink,  white  &  blue.    Is  there  any  difference  between  the  colours  wrt  K  value?
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