04-26-2013, 07:42 PM
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Senior Member
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 Coventry, England, United Kingdom
Join Date: Sep 2012
Posts: 10,576
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Re: how to prevent fading
Result 1 Source
Quote:
All lamps will give off UV but incandescent lamps will give-off unmeasurably small amounts. Discharge lamps essentially all contain mercury and mercury in the discharge gives off UV. However, most lamps are enclosed in UV-absorbing glass, either as primary containment or as an outer enclosure (bulb), so very little gets beyond the outer bulb.
If any lamp emits more then almost no UV, it has to be marked (R in the US), and a warning given that it cannot be used in an open fixture - in other words, it must be used behind a UV absorber (usually what is called soft glass - similar to normal window glass).
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Result 2
(Too much to quote)
Last edited by LowlyAssassin; 04-26-2013 at 07:45 PM.
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