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Re: [APD] How much light actually gets down here?
Brilliant! This lets us kill two..ah..fish with one light? The old
magnifying glass and sun trick.
On May 3, 2007, at 11:03 AM, S. Hieber wrote:
> Hmm. Perfect parabolic puts light where we want it? WEll here's a
> jumping off point. Sometimes we want a very tightly focused "spot"
> of light (e.g, when working non small electronic circuits) but
> probably rarely and surely not often. Even over an 30 gallon
> aquarium a two or three inch wide swath of light running the length
> of the tank would be of rather limited utility -- well, you'd have
> some weird aquascapes, anyway. In fact a few of us have been known
> to flex an AHS reflector outward on some tanks to increase the
> spread of the light. I've done the narrow swath kind of things,
> sort of, using very narrowly focused LEDs but the effect is, well,
> disappointing is the best that can be said for it.
> Image a car headlight that shown a nonspreading column of light
> only a few inches in diameter -- why, we'd kill even more folks on
> the road than we do now. Which, I guess, brings us around to the
> killin' subject again.
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