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Re: [APD] AHSUPPLY's Reflectors

I don't have one of AH's reflectors, but from their website it seems that they consist of flat surfaces, not a parabolic surface. So, there is no exact focal point. I am going to make a version of what it appears to be, using wood and aluminum or stainless steel tape as the reflective surface (J.C.Whitney has stainless steel tape), and use it for a set of three parallel T8 bulbs. I think I can increase the light output from the two outer bulbs in the set by as much as 50% over what a single white painted flat surface behind the bulbs would give. This will be a subjective experiment since I have no means of actually measuring the light. With any reflector you can just look at the light and if you see a nearly uniform, but wide area of light you are successful to some degree. (Plus, look at all the fun you get by doing it this way!)

On Tuesday, February 8, 2005, at 10:52 PM, Chris Hotte wrote:

Raymond Wong wrote:

Hi and thx everyone for their responses about the Ahsupply.

But... Has anyone tried their reflectors with lights other than the ones
supplied with AH Supply say t8,t5's t12's?
Do you think it'll work since the cost is pretty good considering a 36" ish
reflector from Ahsupply is \$20 USD + shipping, I really can't find any other
reflectors for about that price.
But is this reflector for one tube or can I use it for 2 or more t5 tubes?

After a short study on the subject, here's what I've come to understand so far. The curved surface only works if the focal point is used as a point of origin. It should give back a more or less a uniform light distribution from it. The focal point is fairly obvious and easily calculated with y=sqr(x)/4p, p being the focal point. It's a good idea if it does in fact give back the %65 gain over rectangular reflectors as stated at ahsupply. I for one cannot see why it wouldn't. However, as you step your light source out of the focal point, you start to loose the benefit and hinder it with bounce back. So, trying to cram in more bulbs into a parabolic reflector would effectively jam it up and put it back on par with a rectangular reflector. I would even be willing to bet on the smaller the source, and the more accurately placed, the more efficient the parabolic effect. On the other hand, the limit to effeciency gained by placement would have to be defined by the diameter of the curve and size of the litght source.

Of course, when everything is said and done, just play with it and see what you get. *grin*

```http://usna.edu/Users/physics/mungan/Scholarship/ParabolicMirror.pdf
http://www.jc-solarhomes.com/do.htm
http://www.downeastmicrowave.com/PDF/dishfp.PDF```

```Chris.
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