Maxlite 35861 lamps are designed to manage heat so that lumen maintenance is maximized. Critical components (susceptible to heat failure) are chosen for their high heat tolerance. The body of the lamp is vented with patented air gaps to increase cooling air flow. MaxLite lamps also include a thick aluminum heat sink between heat producing components to remove even more heat from the lamp. Ideal uses include high and low bays, gymnasiums, warehouses, churches, wall packs, shop floors, and parking garages.Features instant-on, self ballasted design. Vented to increase cooling air flow.