Bare skin contact with the quartz envelope must be avoided. Compounds from the skin when heated on lamps operating at 600 to 850˚c will form permanent etching (devitrification) on the quartz surface, decreasing UV energy transmission. A contaminated lamp eventually will overheat causing premature failure. Alcohol wipes and rubber gloves are included with every purchase of a quartz sleeve or lamp. NOTE: In case of contact with bare skin, decontaminate lamp with alcohol wipe before returning to use.