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http://indianaquariumhobbyist.com/community/ :: View topic - light for a 2 ft deep tank
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light for a 2 ft deep tank
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Manu1979
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PostPosted: Sun Jan 04, 2009 12:17 am Post subject: light for a 2 ft deep tank Reply with quote

 Can  anyone  please  suggest  me  the  best  light  for  a  2  ft  deep  planted  tank.  I  have  36wt  PLL,  26  wt  T5  and  25  wt  CFL  available  in  my  options.  I  also  want  to  know  the  difference  between  these  lights.  The  shopkeeper  told  me  that  PLL  and  CFL  are  practically  the  same.
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Tirtha C
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PostPosted: Sun Jan 04, 2009 12:22 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 If  the  depth  is  2  feet  and  if  you  are  planning  for  planted  tank,  go  for  either  T5  HO  or  MH.  CFL,  PLL,  T8  will  not  suffice.  
 
 To  know  more  about  lights  for  planted  tank,  please  go  through  the  old  posts.
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Prem kk
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PostPosted: Sun Jan 04, 2009 10:43 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 Hi  Manu,
 
 A  lot  depends  on  what  you  want  to  grow  in  your  tank.  What  is  the  specs  of  your  tank?
 
 The  problem  with  2  foot  height  tank  is  that  you  cannot  grow  much  of  foreground  plants.  I  have  a  2  foot  height  tank  and  I  have  grown  Marsilea  Hirsuta  and  Saggitaria  Subulata  as  a  sucessfully.  Glosso,  HC  etc  did  not  do  well.  If  your  not  particular  about  foreground  plants  then  you  can  go  for  the  standard  T-8  tubes.  Its  easily  available  and  cost  effective  too.
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Manu1979
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PostPosted: Tue Jan 06, 2009 12:32 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 I  want  to  grow  drarf  grass.  So  am  concerned  about  intense  light.  T5  of  25w  and  PLL  36  w  are  only  available  here.  MH  is  expensie.
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natureaquariumlover
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PostPosted: Tue Jan 06, 2009 1:04 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 Manu  CFL  or  PLL  would  do  but  you  need  to  concentrate  on  the  Kelvin  rating.  I  agree  with  Prem  in  a  2  ft  deep  tank  you  would  find  it  difficult  to  grow  Glosso  or  HC.  I  don't  think  Hair  Grass  should  be  a  problem.
 
 I  have  grown  both  Glosso  and  Hairgrass  using  AZOO  CFL  (36  W)  of  10000  K  rating.  If  you  don't  get  this  then  atleast  look  for  Osram  8500  K  CFLs.  Anything  less  then  that  you  better  not  try  Glosso.  Hair  Grass  my  guess  will  grow  in  6500  K  provided  you  have  a  nutrient  rich  subsrate,  it's  a  grass  ulitmately.
 
 The  other  factor  is  looks.  I  have  seen  dwarf  hair  grass  in  a  2  ft  deep  tank  looks  odd.  I  would  again  agree  with  Prem  on  trying  Saggitaria.  Even  Echinodorous  Tenellus  is  a  good  choice.
 
 Raj
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harshal
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PostPosted: Tue Jan 06, 2009 12:40 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 Hi  Manu
 
   Well  to  start  with  you  can  grow  glosso  HC  etc  definitely  in  6500k  temp  too.  My  advice  would  be  to  stick  with  T5HO  or  the  2nd  best  option  would  be  PLLs  not  CFLs.  The  difference  between  the  two  is  Plls  need  separate  Ballast.
 With  T5HOs  look  at  achieving  2.5w/gal
 With  PLLs  look  at  achieving  3W/gal
 
 Remember  that  the  kelvin  Rating  will  depend  on  the  kind  of  plants  you  use.
 General  rule  -Higher  kelvins  will  be  good  for  Green  plants  lower  for  red.
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PostPosted: Tue Jan 06, 2009 1:18 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 Harshal  I  couldnt  understand  this  equation  between  Higher  Kelvin  and  Green  Plants  and  lower  Kelvin  and  reld  plants.  Can  you  please  explain
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Tirtha C
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PostPosted: Tue Jan 06, 2009 1:59 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

                                                   
natureaquariumlover  wrote  (View  Post):                
Harshal  I  couldnt  understand  this  equation  between  Higher  Kelvin  and  Green  Plants  and  lower  Kelvin  and  reld  plants.  Can  you  please  explain                

 
 Higher  Kelvin  Rating  means  more  of  Blue  Spectrum  which  is  good  for  Green  Plants.  Lower  Kelving  Rating  means  more  of  Red  Spectrum  which  is  good  for  Red  Plants.  
 
 Now  a  days  Kelving  is  not  the  ultimate  measures  of  Color  Spectrums  but  still  we  can  start  of  with  this.
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PostPosted: Tue Jan 06, 2009 7:46 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 I  guess  Red  Plants  look  red  because  it  absorbs  all  other  spectrums  and  reflects  red  back  mainly.  Will  it  be  right  to  infer  that  red  plants  requires  red  spectrum?
 
 Mr.  Amano  feels  that  loss  of  red  wave  lengths  is  higher  in  water  and  he  feels  that  aquatic  plants  have  evolved  to  use  blue  and  green  spectrum  more.  Hence  more  of  Blue  and  Green  spectrum  will  be  required  for  aquatic  plants  (may  be  irrespective  of  their  leaf  colour).  http://www.aquajournal.net/na/notes/002/index.html
 
 OSRAM  has  got  a  Tubelight  called  Floura  (http://www.osram.cz/_global/pdf/Professional/General_Lighting/Fluorescent_lamps/103S011GB_FLUORA_flowers_blossom.pdf)  which  gives  higher  red  and  blue  spectrum  and  has  been  designed  for  cases  where  terrestrial  plants  are  kept  in  conditions  where  they  do  not  receive  natural  day  light  like  when  they  are  kept  indoors  like  in  Shopping  Malls  or  Hotels.  I  have  used  them  in  aquariums  of  less  then  2  ft  deep  and  have  got  good  result  for  both  green  and  red  plants  though  the  visible  colour  rendering  of  the  tubes  are  red.
 
 Yes  Kelvin  is  not  the  only  measure.  My  thumb  rule  for  using  higher  Kelvin  ratings  is  that  it  might  ensure  that  there  are  sufficient  blue  and  green  spectrums  that  can  reach  an  aquatic  plant  at  a  certain  depth.  This  is  my  shortcut  to  choose  lights  for  aquariums  in  absence  of  sophisticated  PAR  meters  etc.  
 
 But  then  again  only  Blue  Spectrum  is  not  good  too  so  one  can't  use  Actinic  Lamp.  Hence  I  have  now  settled  for  8000  t0  8500  K  which  thankfully  gives  decent  helping  of  Blue/Green  and  Red  Spectrum
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Tirtha C
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PostPosted: Tue Jan 06, 2009 9:20 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

                                                   
natureaquariumlover  wrote  (View  Post):                
I  guess  Red  Plants  look  red  because  it  absorbs  all  other  spectrums  and  reflects  red  back  mainly.  Will  it  be  right  to  infer  that  red  plants  requires  red  spectrum?
                 

 
 You  are  right  that  Red  Plants  reflects  Red  Lights.  But  If  you  use  mostly  Blue  and  Green  Spectrum,  there  will  be  nothing  to  reflect  and  they  will  turn  Green.  
 
 Don't  look  at  the  Kelvin  rating  only  what  Mr.  Amano  uses.  Search  the  net  to  see  the  Spectrum  Distribution  Of  ADA  lights.  May  be  they  are  8000K  but  they  are  providing  the  full  series  of  Spectrums.  If  I  am  not  wrong  Solar  2  series  has  Higher  Green  Spectrum  thats  why  Plants  looks  much  much  green.
 
 But  when  you  are  planning  to  use  PLL/T5/T8/T5HO  you  don't  have  many  choices  so  you  can  pick  up  based  on  Spectrum  Distributions.  And  remember,  if  you  are  using  8000K  tubes  which  does  not  have  other  spectrum  proportionately,  you  will  invite  algaes.  It's  a  proven  truth  that  too  much  Blue  Spectrum  trigger  algae  growth.
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PostPosted: Tue Jan 06, 2009 11:20 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 so  then  which  is  the  best  suited  light  to  grow  foreground  plants  apart  from  glosso  and  HC  cuba?
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PostPosted: Tue Jan 06, 2009 11:31 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 T5  imo  or  if  u  can  go  for  T5  HO.
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PostPosted: Tue Jan 06, 2009 11:38 pm Post subject: Re: light for a 2 ft deep tank Reply with quote

 Here,  T5  of  26  w  and  pll  of  36  wt  are  available.  So  have  to  choose  from  these  only.
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PostPosted: Wed Jan 07, 2009 1:13 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 I  guess  the  plants  will  look  blackish  as  they  will  have  nothing  to  reflect  back.  Definitely  not  green.
 
 ADA  MH  has  got  a  spectrum  distribution  which  is  high  in  green  and  blue  and  also  some  red  -  not  the  full  spectrum.  Solar  II  seriez  is  a  fixture  using  PLLs  but  in  ADA  whether  you  gor  for  Tubes  of  PLLs  or  MHs  they  all  are  rich  in  green  and  blue.  Note  that  Amano  manges  to  gorw  excellent  red  plants  as  well!!
 
 Manu:  My  experience  again.  
 
 The  choice  of  light  actually  depends  on  what  type  of  setup  CO2  or  non  CO2.  It's  always  a  question  of  balance  so  more  CO2  (or  faster  growth  expected)  you  have  to  go  for  more  lights.  If  you  are  in  a  non  CO2  setup  High  Output  lights  are  a  recepie  for  disaster.
 
 Can  you  share  the  details  of  the  light  options,  make,  kelvin  rating,  spectrum  distribution  etc.  
 
 Honestly  speaking  you  can  and  you  should  start  with  any  light  (IMO  >  =  6500  K  atleast)  (again  assuming  a  CO2  setup).  Look  for  symptoms  as  to  how  the  system  is  responding  (indicators  like  diatoms  which  are  common  in  new  tank  as  well  as  insufficient  lights)  and  decide  on  changes.  If  you  are  not  sure  (or  not  wanting  to  experiment)  then  you  have  to  rely  on  branded  products  (and  hope  for  the  best  Smile  )
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PostPosted: Wed Jan 07, 2009 6:47 am Post subject: Re: light for a 2 ft deep tank Reply with quote

 Does  the  spectrum  matter  so  much  for  plant  growth?  Or  is  It  just  for  the  appearance  {Color  and  hue}.
 
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