Using White PVC piping as a reflector of T5

Discussion in 'Lighting' started by ziyaadb, 24 May 2010.

  1. ziyaadb

    ziyaadb

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    Last edited: 24 May 2010
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  3. Nsteyn

    Nsteyn

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    its white, its reflective .. cant see why not? I have read somewhere that white actually works better then reflective metal surface, due to scattering or something.. buy maybe wait for someone with a bit more experience.

    You are thinking of using a round pvc pipe, cutting it in half and use this "dome" as reflector? mmm sounds like a plan to me... would be very intrested in the result of this.... so keep us updated if you actually go ahead and do it.
     
  4. butcherman

    butcherman Moderator

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    sounds interesting keep us posted
     
  5. OP
    ziyaadb

    ziyaadb

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    yes thats the idea.
     
  6. neil.h

    neil.h

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    Ziyaad, why not get the polished aluminium reflectors designed for this? Too expensive?

    FW planted guys use the white PVC gutters that are already open ended ;)
     
  7. OP
    ziyaadb

    ziyaadb

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    Its a terrible type thats available. Like a half dome and at 120 each(i need 8) I would not mind paying if i was getting Parabolic or gullwing type.
     
  8. SIMS

    SIMS

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    interesting...when I get my par meter back from Rob I will giv it a try and let you know the results
     
  9. OP
    ziyaadb

    ziyaadb

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    awesome thanks mate
     
  10. Sentari

    Sentari

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    Great idea Ziyaad ive also been thinking of this.

    My hood is painted white also and the reflection is amazing.

    Also how would you cut the pvc?

    180 Degrees? or less or more?
     
  11. OP
    ziyaadb

    ziyaadb

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    less
     
  12. Jaco Schoeman

    Jaco Schoeman

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    Well. now that I think about it, let us go back to Std 7 Science... Black colour absorbes all the light spectrum, whilst white reflects it fully... That is why black paper in sunlight doesn't hurt your eyes, but white paper in the same sunlight will hurt your eyes...

    Logic tells me it will work, but a PAR meter reading might tell us more.

    Personally I think that a reflector might be better, but not in margins that makes justifies buying them at R100 each...
     
  13. OP
    ziyaadb

    ziyaadb

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    Will use the cheap stuff now and see for the expensive stuff later on. Great reflectors do make a beeeg difference but i want to buy proven reflectors. until then lets see what we can do
     
  14. Norman_the_fish

    Norman_the_fish

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    really dumb question here, but would a mirror not be best? ie positioned above the lights where your reflector would be assuming you didn't opt for a curved surface?
     
  15. jacquesb

    jacquesb Retired Moderator

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    No Norman - as the glass on the mirror refracts the light. It looks like a mirror will reflect light, but does not do this efficiently.
     
  16. OP
    ziyaadb

    ziyaadb

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    light has to penetrate the mirror then reflect back out the glass again.
    plus the glass would get very very hot
     
  17. Munky82

    Munky82

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    Slightly off topic... what paint's the best/safest ? normal pva?
     
  18. PeterL

    PeterL

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    Considering it doesn't come into contact directly with the water, I would go the PVA route, you need some sort of paint which does not allow the moisture to get between the canopy and the paint otherwise it will just bubble in no time at all and you would have just wasted good time painting for nothing.

    Ultimately, painting works, but why not just save up for the reflectors which are tried and tested? If your LFS can't supply, ask someone on MASA to help out with their LFS or try one of the sponsors - they are sure to be able to help.
     
  19. Rory

    Rory Admin

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    I use half a 110mm pipe covered on the inside with aluminium tape as a reflector for my algae filter. (big energy saver bulb fits in fairly well, think its a 45W)
     
  20. OP
    ziyaadb

    ziyaadb

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    aarg decide to rather spend a bit and get the reflectors. Will buy a few at a time and do it right 1st time.
     
  21. dallasg

    dallasg Moderator

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    ziyaadb, i made some from alanod, highly reflective alumium, at 1200mmx15mm they worked out to be R35 each
     

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