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http://indianaquariumhobbyist.com/community/ :: View topic - What wattage of CFL Lamp for good plant growth.
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What wattage of CFL Lamp for good plant growth.
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joyban
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PostPosted: Tue Apr 21, 2009 7:51 pm Post subject: Re: What wattage of CFL Lamp for good plant growth. Reply with quote

 Hi  Rana
 
 
                                                 
Quote:                
PLL  stands  for  PHASED  LOCKED  LOOP                

 
 PLL  here  does  not  stand  for  PHASED  LOCKED  LOOP  at  all  reference  to  the  Lamps.
 
 PHASED  LOCKED  LOOP  are  electronic  Circuits  that  compares  an  input  frequency  and  phase  to  a  reference  signal.  It  then  generates  a  voltage  proportional  to  the  difference  between  the  input  and  the  reference.  They  are  mostly  used  in  digital  and  mixed  mode  (analog  and  digital)  applications  as  regulators,  demodulators,  synchronizers  and  frequency  multipliers  and  dividers.  
 
 These  Circuits  hence  have  no  use  in  driving  the  PLL  through  a  ECG(electronic  control  gear)  or  a  CCG(conventional  control  gear).
 
 
 Quoting  from  the  Philips  Website  
 "1980  -  New  phosphors,  because  of  their  superior  behaviour  under  high  radiant  loads,  allow  miniaturization  of  the  fluorescent  lamp.  Philips  is  the  first  to  launch  compact,  narrow-tube  fluorescent  lamps:  the  SL*  lamp  in  1980  and  the  PL  lamp  in  1981."
 
 For  more  reference  =  http://www.lighting.philips.com/gb_en/about/sub_feature_4.php?main=gb_en&parent=1&id=gb_en_about&lang=en
 
 I  would  probably  try  and  use  MASTER  PL-L  55W/865/4P  1CT  with  a  combination  of  MASTER  PL-L  55W/840/4P  1CT  and  try  Actinic  BL  20W  at  the  back  for  Red  Plant  Growth,  though  I  have  never  tried  to  grow  these  red  plants  in  a  Actinic  BL  20W  but  as  far  as  I  have  understood  Red  pigmentation  seems  to  be  an  effect  of  Flavenoids  caused  by  UV  Light   (  Ref:-  http://indianaquariumhobbyist.com/community/modules.php?name=Forums&file=viewtopic&p=142325#142325)
 
 Regards
 
 Sujoy
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Shreyasmrao
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PostPosted: Wed Apr 22, 2009 3:57 pm Post subject: Re: What wattage of CFL Lamp for good plant growth. Reply with quote

 And  my  small  bit  addition  to  light  penetration.  
 
 Sunlight  is  known  to  be  between  5000  to  6000  Kelvin  during  normal  daytime,  so  generally  lights  are  made  at  this  kelvin.  For  water,  the  higher  the  kelvin  the  better  the  penetration.  If  you  have  a  2  Ft  tank  for  example  and  have  carpet  plants,  you  can  use  8000  or  10000  Kelvin  bulbs,  but  as  you  want  to  use  them  for  your  red  plants  at  the  back,  you  can  use  a  4000K  which  will  appear  more  orangish  than  blueish  (and  will  therefore  have  the  least  water  penetration).  I  am  told  that  the  Kelvin  range  below  4500  really  brings  out  the  red  in  the  plants...  My  red  plants  at  the  back  are  doing  really  well  because  of  the  4000k  T5  tube.
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cichlidlover
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PostPosted: Wed Apr 22, 2009 5:20 pm Post subject: Re: What wattage of CFL Lamp for good plant growth. Reply with quote

                                                   
Rana  wrote  (View  Post):                
Deba
 
 PLLs  are  also  CFL  lamps,  CFL  is  a  general  terminology  to  represent  these  type  of  triphosphore  high  intensity  efficients  lamps.
 
 PLL  stands  for  PHASED  LOCKED  LOOP  which  utilises  an  external  electronic  ballast  only  for  current  frequency  control.  It  utilises  4  pins  in  holder.
 
 There  are  other  technologies  also  CCFL  (Cold  Cathod  Flurocent  Lamp)  ,  PLC  (Programmed  Logic  Control),  ¬†etc.
 
 However  it  does  not  matter  what  bulbs  are  you  using;  essentially  all  are  triphosphor  flurocent  lamps  and  can  produce  your  desired  result  depending  on  spectrum  and  intensity.
 
 A  lamp  will  appear  more  bright  aka  more  lumen  if  its  spectrum  covers  a  large  amount  of  its  light  distribution  in  green  range.  But  plants  donot  utilise  the  light  frequency  in  green  range,  so  lumen  is  important  for  brightness  and  appreance  for  the  aquarium  but  not  relevant  to  plant  growth  requirement.  Human  eyes  respond  more  to  the  green  spectrum,  hence  normal  commercial  bulbs  aredesigned  accordingly
 
 Plants  tubes  like  OSRAM  Floura  emits  its  light  spectrum  in  red  and  blue  zone  with  very  little  spread  in  green,  so  they  appear  very  dim  and  pinkish.  But  plants  can  grow  very  well  under  these  types  of  lamps.  So  just  do  not  go  for  higher  lumen  ratings  only
 
 I  suggest  you,  choose  full  spectrum  bulbs  like  OSRAM  954  PLLs  or  Biolux  FL.  
 
 Hope  this  will  help  you  to  choose  your  bulbs.
 
 Regards
 Rana                

 
 You  have  made  a  khichdi  of  electronics  and  optics   Chuckle
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Shreyasmrao
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PostPosted: Wed Apr 22, 2009 5:37 pm Post subject: Re: What wattage of CFL Lamp for good plant growth. Reply with quote

 There  are  too  many  contrary  views  available  on  different  websites  and  forums.  My  brain  is  a  Lumen  and  Kelvin  khichdi  as  of  now...  totally  confused.
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