Approximately 40 minutes after energizing a metal halide 1000 watt lamp technicians heard a buzzing noise and then a "pop" and heard glass raining down to the floor below (approximately 60 feet). The metal halide bulb failed and shattered the outer glass envelope of the bulb. The high bay lighting fixture is a non-protected (no grill or deflector) fixture. The technicians later noticed a smell of burning wood. When they investigated, they found that a piece of the hot glass fell on a wood pallet, causing a dime sized char mark. (Photos included in attachment.)
Lighting fixtures and replacement bulbs should be evaluated for the application. Open (unprotected) fixtures should be re-lamped with bulbs that have provisions to contain a bulb failure as to not cause further property or personnel damage.
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