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[gomeztime]

Herptrader is absolutely right about Halogens and temperature. If they run cooler than spec they won't last as long. Halogens on dimmers will also have a shorter life span for the same reason.

This aside; when measuring UVB output from naked Halogens (Dichroics) without a "UV stop", I've still not recorded ANY UV-B. This means that the manufacturers have also managed to play with the glass surrounding the gass and filiment to reduce the UV output so I would not recommend using them at all for UV requirements. Manufacturers often make changes so a brand and model of lamp that once did produce UV is no garrantee that it still does in the latest version.