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BlueToBits
Does anyone know if the UV filtering of metal halide lamps is done by the 'safety glass' in the fitting, or the outer tubular envelope of the lamp (or both) ? I've come across an installation where two working lamps were discovered, even though the envelope had completely failed and in one instance was lying shattered on the top of the safety glass. Should this be even be possible? Is UV radiation a significant issue in such circumstances?
Thanks
Thanks
