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http://indianaquariumhobbyist.com/community/ :: View topic - Creating Parabolic Reflector for CFL
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Creating Parabolic Reflector for CFL

 
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Tirtha C
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PostPosted: Fri Aug 10, 2007 11:30 pm Post subject: Creating Parabolic Reflector for CFL Reply with quote

 While  planning  for  a  new  1.5  feet  Moss  cube  I  stuck  with  the  light  and  reflector.  Then  I  have  decided  to  use  CFL  for  the  tank  and  started  to  hunt  for  a  good  reflector.  As  usual  in  Gurgaon  I  failed  to  get  a  reflector  for  CFL.  Then  started  with  my  own  Idea  and  get  a  nice  reflector  which  costs  me  25/-.  Below  is  the  steps.
 
 Requirement:
 
 1.  Aluminium  Wrap  (Use  to  wrap  food)
 2.  A  Plastic  bowl  (Depend  on  the  size  of  the  reflector  you  Want)
 3.  Faviquick  (5/-  one)
 4.  Some  Wheat  Flour  and  boiling  water
 5.  Edit  news  papers
 6.  A  shoe  Box  cover
 7.  1  Bulb  Holder,  1  plug  and  wire
 
   Process:
 
 Get  a  parabolic  plastic  bowl  based  on  the  reflectgor  size  you  want.
 
 
 
 Wrap  the  outer  side  of  the  Bowl  with  Aluminium  Foil.  Make  sure  there  is  no  open  space.  If  you  want  you  can  seal  the  foil  joints  with  Selotape.
 
 
 
 Now  paste  some  pieces  of  news  paper  on  the  foil  using  Faviquick.  No  need  to  paste  them  completely,  make  sure  they  just  got  a  hold  on  that  foil.
 
 
 
 Now  we  need  to  pactice  some  class  room  tutorial  Smile  and  make  the  fingur  stinky.  Add  Boiling  water  to  Wheat  Flour  to  make  a  thick  paste.  Do  not  make  the  paste  much  soft  and  wet.  Now  apply  the  paste  all  over  the  papers  pieces,  make  it  bit  thick.  Now  again  paste  piece  of  news  papers  on  it.  Repeat  this  steps  for  4-5  times  to  make  the  reflector  thickness  much  better  and  sturdy.
 
 
 
 In  this  step  we  need  to  create  a  Cardboard  circle  using  the  shoe  box  cover  and  paste  it  on  the  top  of  the  structure  to  get  the  shade  in  a  right  shape.  Make  sure  you  made  the  center  hole  in  that  board  which  will  hold  the  holder.  Do  not  make  hole  on  the  paper  or  foil  unless  it  is  completely  dried.
 
 
 
 Thatz  it....  we  are  done.  Keep  the  structure  in  Direct  Sunlight  for  a  day  to  make  it  100%  dry  and  sturdy.
 Take  out  the  bowl  and  Cut  the  edge  of  the  foil  so  it  will  give  us  the  final  Reflector  shape.
 Now  make  hole  through  the  paper  and  Foil  to  attach  the  holder.
 
 
 
 
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krishanu
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PostPosted: Sat Aug 11, 2007 10:50 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 hey  tirthankar...is  your  reflector  bigger  than  the  tank?  if  not,  wouldnt  it  be  a  'spotlight'?
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saikumar
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PostPosted: Sun Aug 12, 2007 10:10 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 wow  Thirthanker,
 good  idea  for  parabola  there,i  thought  you  would  waste  the  bowl  as  a  whole  for  the  reflector  when  i  saw  the  1st  pic.
   Â   Â that  way  would  be  more  sturdy!Smile
 hey  how  about  trying  some  fancy  decoration  papers,which  IMO  are  thicker  than  foil,nd  last  long.like  thishttp://indianaquariumhobbyist.com/community/modules.php?name=Forums&file=viewtopic&t=6579
 
 one  issue  i  would  face  would  be-the  placement  of  the  bulb,because  its  goona  be  lengthier  than  the  height  of  the  reflector,so  u  would  have  better  gone  for  a  taller  bowl.
 
 just  my  4min  views  Very Happy  
 thanku
 Saikumar.
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Tirtha C
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PostPosted: Sun Aug 12, 2007 12:32 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Sai,  good  point....  am  also  was   afraid  abt  same...  but  when  completed  I  saw  only  1-1.5  cm  CFL  bulb  is  coming  out  of  the  reflector.  If  I  wont  get  the  desired  effect  then  will  pull  the  holder  bit  out  so  it  can  accomodate  the  CFL  completely  inside  of  it.  
 
 Using  a  bowl  will  be  sturdy.....  but  I  wont  love  to  be  killed  by  my  wife  to  spoil  her  kitchen  accesorries  Very Happy  
 
 Planning  to  put  some  fancy  paper  to  make  it  bit  nice  looking  Smile
 
 @Krishanu,  my  reflector  size  is  bit  less  than  the  tank  top.  But  that  wont  be  a  problem,  as  I  put  the  set  right  above  the  water  level.  There  will  be  very  less  chance  that  the  light  get  diffused.
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sandeepraghuvanshi
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PostPosted: Sun Aug 12, 2007 8:54 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Hi
 Won't  the  heat  of  CFl  melt  the  plastic.
 The  holders  of  CFL  get  pretty  hot.
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Tirtha C
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PostPosted: Mon Aug 13, 2007 2:01 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Sandeep.....  there  is  no  plastic  at  all.....  It's  all  made  from  Aluminium  foil  and  newspaper...  Smile
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rgg
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PostPosted: Mon Aug 13, 2007 11:41 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Good  idea  tirtha...
 
   I  suppose  dessipation  of  heat  is  the  only  concern.  And  news  papers  if  they  get  wet  by  moisture  can  break  up.
 
 Raghu
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harshal
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PostPosted: Mon Aug 13, 2007 12:14 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Hi  Tirthankar  
 
      Thats  a  good  idea  you  have  there   Smile  .
      I  will  recomend  one  thing  place  the  bulb  from  the  side  of  the  bowl  insted  of  the  top  of  the  bowl.  This  way  you  will  get  more  direct  light  from  the  lamp,  this  will  increase  the  efficency  of  the  fixture.  In  the  present  placement  of  the  lamp,most  of  the  light  is  reflected  or  diffused.  This  can  be  changed  by  placing  the  bulb  sideways.
 
 Regards
   Harshal
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maveric_doc
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PostPosted: Mon Aug 13, 2007 2:05 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 hey  T2CHATTO...dont  want  to  deter  you  or  somrthing  but  
 just  a  thought  wont  you  be  better  of  using  a  2  wheeler  headlight  reflector  for  this  purpose  ,  you  can  get  them  as  low  as  20  bucks.
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Tirtha C
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PostPosted: Tue Aug 14, 2007 2:36 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 @Raghu.....  Thanks  for  the  kind  words.  I  am  also  thinking  about  the  heat  factor.  The  thickness  of  the  shade  is  not  so  much...  so  heat  dessipation  will  take  place  easily.  Let  me  start  using  it.  I  will  post  the  results.
 
 @Harsahl.....  Thanks  for  the  valuable  input.  But  only  concern  is....  the  structure  is  made  from  paper.  if  I  put  the  bulb  side  ways.....  will  it  be  able  to  carry  the  weight  of  CFL?  Is  there  any  quick  idea  to  make  the  reflector  more  sturdy?  
 
 Maveric.....  if  we  use  2  wheelers  headlight  reflector...  we  need  to  restrict  ourself  to  a  small  size  CFL.  Otherwise  it  will  comeout  of  the  dome....
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deepesh
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PostPosted: Tue Aug 14, 2007 7:50 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Heat  tolerance  over  a  period  of  time  rather  than  heat  dissipation  is  my  concern.  I  think  the  newspaper  might  char  over  time.  CFLs  rarely  get  hot  enough  to  ignite  paper.  Paper  has  a  kindling  point  of  about  200  C.
 
 You  can  still  increase  the  thickness  of  the  papier  mache.  Varnish  or  paint  is  often  used  with  papier  mache  to  make  it  water  proof  and  to  make  it  a  little  more  stiff,  however  I  dont  know  if  either  is  safe  at  the  higher  temperatures  near  a  CFL.
 
 deepesh
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Madan
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PostPosted: Tue Aug 14, 2007 7:59 am Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 How  about  using  old  Ambassador  or  Premier  Padmini  headlight  reflectors.  Those  were  designed  during  WW  II  I  think  and  were  perfect  parabolas.  They  were  made  of  metal  to  boot.  Just  a  thought.
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traktap
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PostPosted: Thu Aug 30, 2007 5:15 pm Post subject: Re: Creating Parabolic Reflector for CFL Reply with quote

 Thirth,  
 
 Its  a  cool  thing  you  have  done  ...  it  worked  for  me  too  .  I  can  c  the  brightness  thrice  than  before.  !!  
 
 Thanks  for  sharing
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