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Hi Brian,
That depends on the lights themselves. I guess you are referring to Metal Halides, if so I have used as a replacement heat shield glass (pinkish in colour). It workded perfectly, but expensive. It also has the property of not smashing into a thousand pieces when been splashed.
Pls never run a double ended MH without a glass shield you will probably kill everything in sight in a very short time.
Single ended bulbs are fine (i believe) to be used without a safety shield this is from a UV point not a splash resistant point of view.
Any toughend safety glass i've heard is fine, as glass naturally has a UV shield built in it.
The best option is to contact your MH manufacturer and ask for a replacement glass. Firstly it will fit and secondly you know its got all the right levels of filtering.
I hope this helped.
Regards
Simon
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