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http://indianaquariumhobbyist.com/community/ :: View topic - ballast compatible for 10 watt t8 tube
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ballast compatible for 10 watt t8 tube

 
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dj_square
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PostPosted: Fri Jul 06, 2007 12:52 am Post subject: ballast compatible for 10 watt t8 tube Reply with quote

 hey  hi  to  all  of  u,
 
 here  i  would  like  to  ask  a  simple  question  wether  i  can  connect  10watt  t8  hitachi  flourecent  tube  with  a  15watt  ballast  (choke)
 
 thanks  in  advance
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rgg
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PostPosted: Fri Jul 06, 2007 10:06 am Post subject: Re: ballast compatible for 10 watt t8 tube Reply with quote

 Buddy  should  not  be  a  problem.
 
 Raghu
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harshal
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PostPosted: Fri Jul 06, 2007 11:43 am Post subject: Re: ballast compatible for 10 watt t8 tube Reply with quote

 hi  dj_square
 
    Yes  you  can.  You  will  be  over  driving  your  tube  which  would  mean  that  the  tube  life  will  be  lowered  by  quite  a  bit.  If  you  are  ok  with  it  than  its  not  a  problem  the  lamp  will  definately  run  with  a  higher  rating  Ballast.
 
   Regards
   Harshal  Mehta
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rgg
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PostPosted: Fri Jul 06, 2007 12:20 pm Post subject: Re: ballast compatible for 10 watt t8 tube Reply with quote

 DJ,
   I  hope  you  are  using  electronic  ballast  and  not  electro  -  magnetic  /  coil  /  inductive   ballast.
 
 Harshal,
   This  to  me  i.e.  when  we  have  the  same  wiring  of  electronic  ballast  we  are  not  overdriving.  Just  that  we  are  underutilising  the  capeability  of  a  ballast.
 
 In  a  simple  DC  power  calculations  we  know  that  power  is  IsquareR,  note  that  voltage  is  a  constant  parameter,  Since  the  only  path  in  a  normal  tube  connectivity  is  the  tube  itslef,  There  is  no  way  to  increase  the  current  flow  Â (  except  for  the  matter  of  fact  that  some  passive  electric  parts  are  added  to  do  this  which  we  are  not  doing  ).  
 
 I  suppose  this  also  applies  for  AC  currents,  But  one  should  calculate  the  impedence  here  rather  than  resistance.  Since  the  current  is  the  same  and  the  impedence  is  the  same  the  power  consumed  by  this  normal  wiring  will  be  a  factor  specified  by  the  tube.
 
 Overdriving  is  chaning  connectivities  and  making  current  flow  through  multiple  paths  and  join  the  same  path  at  which  they  enter  the  tube  in  lay  mans  terms.  
 
 The  picture  at  link
 
 http://www.geocities.com/teeley2/overdrv1.html
 should  tell  what  over  driving  is....
 
 
 Raghu
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dj_square
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PostPosted: Fri Jul 06, 2007 4:21 pm Post subject: Re: ballast compatible for 10 watt t8 tube Reply with quote

 thanks  for  your  all  replys,
 
 ok  that  means  if  i  use  15w  ballast  it  will  do  or  i'll  hav  to  get  10w  ballast,  currently  the  ballast  i  have  supports  15w-40w  tubes???
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