Industrial Grade 5,000 hour reflector incandescents are engineered to last up to 8 times longer than standard light bulbs, therefore reducing operational and maintenance costs, and saving both time and money. Equipped with a rugged 5 filament support, pure tungsten coil, reflector disc, and brass base, Industrial Grade lamps will burn continuously for an average life of 15 months in commercial applications and up to 6 years in basic household use.