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MH Retrofit and UV lens shielding
I'm in the process of constructing a DIY MH Pendant. My question concerns
the use of either a glass or acrylic lens for this fixture. My
understanding is that nearly all single-ended MH bulbs available in the
U.S. have a U.V. barrier as part of the bulb construction. If this is true
the only purpose of a lens would be to protect the hot bulb from moisture
and possible explosion from rapid cooling? I consulted a large commercial
supplier of metal halide fixtures who had heard of this "exploding bulb
theory" and commented by calling it "baseless in practical experience".
So I ask those of you using MH do you shield your bulbs and why? Is it
because it came from the manufacturer with a shield? Those of you with
retrofits or DIY units do you use a lens and why? Do you use it on a
pendant fixture or on a enclosed hood? What material do you use or recommend?
Lastly, what are the implications of UV light slightly above natural
conditions on fish and plants?
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From Andrew Lester atlester at home_com