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http://indianaquariumhobbyist.com/community/ :: View topic - power consumption - metal halides vs trulites ?
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power consumption - metal halides vs trulites ?
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fishnchips
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PostPosted: Tue Apr 04, 2006 3:06 am Post subject: power consumption - metal halides vs trulites ? Reply with quote

 Hi  everyone,
 
 I  plan  to  start  a  planted  tank.I  need  some  info  regarding  the  lighting.I  want  to  keep  metal  halides  but  am  a  bit  worried  about  the  power  consumption.I  need  to  know  as  to  how  much  it  may  cost  me  monthly  when  i  keep  5  phillips  trulites  or  2  metal  halides  for  my  4  feet  tank.Will  i  save  a  lot  of  money  when  i  keep  trulites?
 I  realise  that  the  tariff  differs  from  city  to  city  but  could  any  of  the  planted  tank  aquarists  give  me  a  fair  idea  of  how  much  i  may  have  to  keep  apart  for  my  aquarium  considering  i  have  to  run  it  for  10  hours  a  day(i  live  in  Bangalore).I  am  a  student  of  commerce  and  i  am  really  bad  with  this  electric  related  stuff    Sad  
 
 thanks
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Madan
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PostPosted: Tue Apr 04, 2006 7:09 am Post subject:  Reply with quote

 I  don't  know  how  much  is  a  lot  of  money  but  you  power  consumption  will  be  about  2  times  for  the  set  up  you  have  described  when  using  MH.
 
 Running  MH  will  cost  you  about  12-14  rupees  a  day  for  your  tank.
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PostPosted: Tue Apr 04, 2006 3:17 pm Post subject:  Reply with quote

 Hi  Madan,
 
 
                                                 
Madan  wrote:                
I  don't  know  how  much  is  a  lot  of  money  but  you  power  consumption  will  be  about  2  times  for  the  set  up  you  have  described  when  using  MH.                

 
 I  don't  understand  the  above  statement.
 
 From  what  I  understand:
 When  5nos.  of  36W  trulites  are  used;  consumption  will  be  180W/h.  So  I  can  see  that  you  are  suggesting  around  360W  of  MH.  But  can  we  compare  these  two  setups  in  the  consumption  point  of  view  alone  ?  I  don't  think  so!
 
 When  equal  watts  are  used  in  both  the  cases  then  the  electrical  power  consumption  will  be  one  and  the  same,  let  alone  the  fact  that  the  MH  would  have  costed  more.  
 
 For  better  results  [i.e.  good  photosythesis]  the  colour  temperature  matter  more  than  the  wattage.
 Phillips  Trulite  36W/86  is  6500Kelvins
 [the  no.-86  stands  for  phillip's  colour  code  and  they  call  it  "cool  day  light"  in  other  words]
 Normally  MH  is  also  available  only  in  such  kelvin  ranges,  but  higher  kelvin  ones  are  also  available  with  good  lfs  on  special  request.
 
 The  advantage  of  MH  is  more  in  deeper  tanks  of  more  than  18"  depth.
 
 Madan  ji,  this  is  my  understanding  so  pls.,  correct  me  where  I  am  wrong!
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Madan
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PostPosted: Tue Apr 04, 2006 4:12 pm Post subject:  Reply with quote

 Hi  Abdul,
 
 Our  friend  wants  to  use  5  Phillips  Trulites  that  is  about,  200  Watts.
 
 For  a  4  feet  tank  he  would  need  2  x  150  watt  Metal  Halides.  The  input  to  run  these  metal  halides  is  about  400  watts.  No  mention  of  the  tank  depth  was  made  in  the  original  post.
 
 That's  what  I  meant  by  MH  will  be  twice  as  costly.
 
 I  am  not  entering  into  a  discussion  about  which  is  better,  I  was  only  answering  the  question.  
 As  for  saving  a  lot  of  money  -  That's  a  relative  term.  I  wouldn't  know  if  a  Rs.  210.00  additional  expense  in  the  electricity  bill  was  a  lot  of  money  or  not.
 
 Nothing  was  asked  about  the  initial  cost.  Only  monthly  electricity  cost.
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PostPosted: Tue Apr 04, 2006 4:32 pm Post subject:  Reply with quote

 Right  buddy  I  understand  your  argument
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PostPosted: Tue Apr 04, 2006 5:01 pm Post subject:  Reply with quote

 Hi  Madan,
 
 Maybe  I'm  being  dense  here  but  two  150  watt  MH  should  consume  150x2=300  Watts.
 
 How  do  you  arrive  at  400  Watts?
 
 Or  is  there  something  I'm  not  clear  about  here....
 
 Regards,
 Venkat
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PostPosted: Tue Apr 04, 2006 5:17 pm Post subject:  Reply with quote

 The  losses  in  the  ballast  or  choke  is  something  you  have  to  worry  about.  This  loss  is  reactive  power,  which  does  no  useful  work  and  partly  is  dissipated  as  heat  in  the  choke.
 
 150  watt  is  the  energy  converted  to  light,  not  what  is  consumed  to  produce  this  150  watt  of  equivalent  light  output,  which  will  be  higher.  200  watts  is  an  approximation.
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PostPosted: Tue Apr 04, 2006 5:28 pm Post subject:  Reply with quote

 I  see...  well  you  learn  something  new  every  day    Very Happy  
 
 
 So  the  MH  lamps  lose  upto  25%  of  the  input....  thats  a  pretty  big  loss...  I  knew  there  was  some  loss  but  not  this  much    Surprised  
 
 And  this  is  not  true  for  normal  fluorescent  lamps?
 
 Regards,
 Venkat
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PostPosted: Tue Apr 04, 2006 5:34 pm Post subject:  Reply with quote

 It's  true  for  normal  Fluorescent  lamps  too,  the  more  "local"  your  Choke,  higher  the  loss.
 
 Electronic  chokes  are  more  efficient  and  losses  a  lot  less.
 
 Unfortunately  electronic  ballast  for  MH  is  not  easily  available  and  expensive  when  available.  Off  late  I  have  heard  of  some  Chinese  make  cheap  stuff,  but  I  am  not  going  anywhere  near  them.
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PostPosted: Tue Apr 04, 2006 5:40 pm Post subject:  Reply with quote

 Let  me  be  a  bit  clear  here  before  the  next  question.
 
 This  is  only  the  electric  input/output  we  are  discussing.  Not  the  light  output.
 
 MH  provide  more  lumens(light  output)  per  watt  of  electricity  converted  as  opposed  to  Fluorescent  lamps.
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PostPosted: Tue Apr 04, 2006 5:50 pm Post subject:  Reply with quote

 Welllll....,  
 I  wasn't  really  planning  that  next  question  but  since  you  have  clarified  anyway...  thanks!!....    Chuckle  
 
 Yes  I  understand  that  the  Lumen  output  per  watt  of  MH  would  be  much  higher  than  fluorescents,  my  only  surprise  was  the  quantum  of  loss  that  you  mentioned  (25%)  which  seemed  awfully  high...
 
 Neways  thanks  for  the  info....
 
 Regards,
 Venkat
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PostPosted: Tue Apr 04, 2006 5:51 pm Post subject:  Reply with quote

 Sorry,  I  remembered  just  now.
 
 This  question  was  posted  in  the  Planted  Aquaria  Forum  when  we  did  not  have  a  separate  Lighting  equipment  Forum.
 
 Since  this  question  is  directly  related  to  Planted  Aquaria  I'll  leave  it  where  it  is.  Very Happy
 
 Read  This
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PostPosted: Tue Apr 04, 2006 6:01 pm Post subject:  Reply with quote

 Very  informative  thread!!  Thanks  Madan...
 
 And  that  has  really  put  me  off  MH  for  the  time  being  at  least    Chuckle  .  I  can't  afford  that  kind  of  power  bills  in  Mumbai  what  with  the  penalty  for  exceeding  300  units  etc.    Crying or Very sad  
 
 Venkat
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PostPosted: Tue Apr 04, 2006 6:04 pm Post subject:  Reply with quote

 Why  is  it  that  a  "Venkat"  always  comes  into  the  light  discussion  I  don't  know!  Very Happy
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PostPosted: Tue Apr 04, 2006 6:10 pm Post subject:  Reply with quote

 Maybe  because  we're  the  "Bright"  ones!!!  
   Cheer    Very Happy    Very Happy  
 
 Regards,
 Venkat
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