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Re: [APD] Re: ah supply reflectors
Beware that potato chip bags will disentegrate into little flakes of
plastic after a while. This creates a big mess in your tank. I
found out the hard way, and just wanted to offer a warning.
On Wed, 09 Feb 2005 14:47:16 -0800, Wright Huntley <whuntley at verizon_net> wrote:
> Shiny aluminum looks great but stinks for reflecting fluorescent lights
> (except for the far blue and UV).
> The AH reflectors are shiny aluminum, but with a dielectric overcoating
> that raises reflectivity dramatically from the original 85% that is
> typical for pure aluminum. Roof flashing and other non-dead-soft alloys
> are probably a worse.
> The screwing you get with aluminum is probably worse than the simple 15%
> loss, as quite a bit of useful light may involve hitting the reflector
> more than once in most designs.
> Hey, it is better than white paint, but not really a lot. The aluminum
> tapes I have tried are quite a lot worse than plain polished Al, BTW.
> If you want to line a hood I suggest you find some of the silvered mylar
> materials that feature reflectivity well over 95%. 3M Silverlux was once
> discontinued, but I still see variations on it for sale around the web.
> Forget plain aluminum or aluminum tape, if you want efficiency. You can
> likely do better with potato-chip bags or cut-up CDs.
> PS. If I was using twin-tube T-5 CFs, I would not hesitate to buy the AH
> reflectors. They are cheaper than anything I have tried that was
> comparable, and a pretty decent optical design. [Not ideal for
> single-tube T-8s tho.]
> Wright Huntley - Rt. 001 Box K36, Bishop CA 93514 - whuntley at verizon_net
> 760 872-3995
> ...frontier society offered 'the most civilized type of association'
> because it had 'the absolute minimum of external regulation' and
> therefore 'the maximum of voluntary civility and morality.'
> ------ Isabel Paterson
> Aquatic-Plants mailing list
> Aquatic-Plants at actwin_com
Light thinks it travels faster than anything but it is wrong. No
matter how fast
light travels, it finds the darkness has always got there first, and
is waiting for it. -Reaper Man, Terry Pratchett
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