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03-19-2010, 04:11 AM | #1 (permalink) |
Join Date: Jan 12 2006 Location: england
Posts: 22
Rep Power: 0 | uvb cant penetrate glass, so how does it penetrate glass tubes??? this is puzzeling me for some time, as i have heard many vit d experts say uvb does not penetrate glass, so how come we can get uvb throgh glass tubes? Can somone explain please Mika |
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