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http://indianaquariumhobbyist.com/community/ :: View topic - MH Vs T5 / T5HO - Power consumption
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MH Vs T5 / T5HO - Power consumption

 
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nature_lover
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PostPosted: Tue Jul 24, 2007 8:35 pm Post subject: MH Vs T5 / T5HO - Power consumption Reply with quote

 Was  reading  old  posts  here  and  many  had  suggested  using  T5s  and  T5HOs  instead  of  MH  for  planted  tanks.  Heat  generation  being  one  issue  and  the  next  being  power  consumption.
 
 I  would  like  some  clarification  here.  Say  I  have  a  100  Gallon  planted  tank,  that  uses  2  MH  of  150W  each  (@  3WPG).  The  other  option  would  be  T5HOs  (54W  or  80W)  bringing  it  close  to  the  same  3  WPG.
 
 How  would  power  consumption  differ  for  the  same  period  of  lighting  between  the  two  -  MH  and  T5s  ??
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aquamann
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PostPosted: Tue Jul 24, 2007 9:18 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Hi  Suraj,
 I  was  going  to  say  watts  are  just  watts  when  figuring  the  power  consumption  but  then  I  thought  of  the  power  used  by  the  ballast  and  the  lamps  may  be  different.  The  only  true  way  of  figuring  the  total  power  used  by  a  fixture  would  be  to  find  the  actual  total  current  draw  used.  My  guess  is  that  the  power  consumption  should  be  about  the  same  for  either  the  fluorescent  or  the  MH.  I  just  found  this  information  which  may  be  helpful  for  you:  
 Metal  Halide  info
 It  looks  like  you  get  more  lumens  per  watt  from  MH  but  I  do  know  they  can  get  quite  hot.  It  also  says  that  the  light  produced  is  closer  to  that  of  actual  sunlight.  This  may  be  more  useful  for  reefers  rather  than  fresh  water  plant  growers.
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Nanu
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PostPosted: Tue Jul 24, 2007 9:54 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 ...I  have  the  same  doubt  as  Suraj.
 I  want  to  get  an  MH  as  well,  but  why  would  my  electricity  bill  be  any  higher  if  As  Suraj  mentioned,  a  300  Watt  MH  setup  &  a  300Watt  T5  ,  T5HO  or  whatever??
 
 ...any  one  know  how  many  watts  consumed  in  an  time  period  is  one  elec.  unit,  on  the  elec.  bill...?  I  think  it  was  something  like  1000  watts  consumed  for  60  mins  =  1  elec.  unit...?  I  could  be  way  off,  so  someone  please  correct  me....
 
 Cheers,
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aquamann
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PostPosted: Tue Jul 24, 2007 10:04 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Yes,  In  the  USA  we  are  charged  by  Killowatt  Hour.  1000  watts  used  per  hour  equals  about  8  cents  charged.
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Deepak_Brid
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PostPosted: Tue Jul 24, 2007 10:23 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

                                                   
aquamann  wrote  (View  Post):                
I  was  going  to  say  watts  are  just  watts  when  figuring  the  power  consumption  but  then  I  thought  of  the  power  used  by  the  ballast  and  the  lamps  may  be  different.  The  only  true  way  of  figuring  the  total  power  used  by  a  fixture  would  be  to  find  the  actual  total  current  draw  used.  My  guess  is  that  the  power  consumption  should  be  about  the  same  for  either  the  fluorescent  or  the  MH.                

 
 Absolutely  right  Charlie,  theoretically  speaking  a  100W  MH  should  draw  the  same  power  as  100W  Fluorescent  Lamp,  however  practically  every  ECG  /  Ballast  will  have  some  internal  losses  &  therefore  the  actual  consumption  will  differ  compared  to  the  output  of  the  lamp.
 
 Lamp  Wattage  +  Control  gear  Wattage  =  Total  consumption  of  the  System
 
 For  E.g.  -  An  Osram  24W  HO  system  will  actually  consume  27W  &  an  80W  will  consume  86W.
 
 However,  for  Incandescent  lamps  the  actual  wattage  consumed  is  that  mentioned  on  the  lamp.  Reason  -  there  is  no  control  gear  to  account  for  losses.
 
 As  for  MH  I  don't  have  the  figures,  need  to  research  more.  Anyways,  I  guess  your  doubt  is  clarified  Smile
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Deepak_Brid
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PostPosted: Tue Jul 24, 2007 10:27 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

                                                   
Nanu  wrote  (View  Post):                
.any  one  know  how  many  watts  consumed  in  an  time  period  is  one  elec.  unit,  on  the  elec.  bill...?  I  think  it  was  something  like  1000  watts  consumed  for  60  mins  =  1  elec.  unit...?  I  could  be  way  off,  so  someone  please  correct  me....                

 
 Hi,
 
 1Unit  =  1KW=  1000W
 
 You  can  consume  it  in  1  hr.  or  10  hrs.  or  100hrs.
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Deepak_Brid
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PostPosted: Tue Jul 24, 2007 11:04 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Hi,
 
 24W  Osram  T5  HO  lamp  when  kept  ON  1  hour  will  consume  27Watts  (see  my  previous  post).Therefore  to  make  it  1  unit  you'll  to  keep  is  about  37hrs.
 
 If  you  were  to  use  4  of  these  lamps  on  your  Aquarium  -  1KW  will  be  clocked  when  you  keep  these  lamps  ON  for  91/2hours
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rgg
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PostPosted: Wed Jul 25, 2007 12:22 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 To  add  to  what  Deepak  said....  
 
 The  losses  in  the  Ballast  of  a  MH  is  approximately  30-40%  (based  on  the  quality  of  ballast).  i.e.  The  power  consumed  by  150W  MH  would  be  then  150W  +  .4X150W  which  is  210  Watts.  
 
 Where  as  the  same  in  a  T5  HO  losses  in  the  ballast  would  be  5%  and  hence  the  power  consumed   would  be  150W  +  .05X150W  which  is   158W.
 
 Added  to  this  a  MH's  lumen  output  of  a  150W  typically  would  be  5000-6000  lumens
 Compare  the  same  with  say  3  T5  Ho  tubes  each  T5  Ho  tubes  would  have  a  lumen  output  of  2700  -  3000  lumens  on  an  avg  and  hence  this  would  account  for  in  excess  of  8000  lumens.  and  hence  one  can  get  the  same  intensity  of  light  as  compared  to  a  MH  in  a  T5  Ho  with  less  than  3  tubes.
 
 I  hope  this  comparision  is  an  apple  to  apple  comparision  and  is  understood.
 
 Raghu
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nature_lover
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PostPosted: Wed Jul 25, 2007 12:34 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Hi  Raghu,
 
 Is  it  mentioned  on  the  ballast  as  to  what  would  be  the  kind  of  consumption/loss  that  it  would  cause?  Is  it  possible  to  calculate  the  same?
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nature_lover
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PostPosted: Wed Jul 25, 2007 12:58 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Just  checked  the  Phillips  website.  Their  electro-magnetic  ballasts  for  MH  cause  a  power  loss  of  only  17W.
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rgg
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PostPosted: Wed Jul 25, 2007 1:27 pm Post subject: Re: MH Vs T5 / T5HO - Power consumption Reply with quote

 Hi  Suraj,
   Look  at  ECG's  and  other  electronic  ballasts.  Most  of  the  ballast  specs  would  talk  about  the  losses.  Osram's  site  too  mentions  about  the  loss  of  any  ballast  for  that  matter.
 
 Note  that  the  Electro  magnetic  ballast  is  of  course  a  power  hungry  device.  Power  is  dessipated  as  heat  due  to  the  inductive  impedence  and  many  other  factors  in  a  electro  magnetic  ballast.  As  far  as  17W  spec  of  a  MH  ballast  look  at  the  operating  conditions  or  the  steady  state  conditions  at  various  tempratures  and  they  would  be  a  lot  more  in  there  than  just  17W.
 
 But  in  an  electronic  ballast  the  passive  components  used  are  SCR's  High  drive  transistors  and  Poly  caps  that  has  a  lot  less  loss.
 
 
 Raghu
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