270/360/450 Watt Ventra High Output HID Replacement Bulb 277-480V EX39 3000/4000/5000KIntroducing Keystone Technologies Ventra High Output HID Replacement corn cob lamps. Built for long life, bold illumination, and dependability, these corn cobs come in a wide range of wattages, with the highest output model producing up to 71,000 lumens. They feature an integrated cooling fan (35W and up models), delivering improved heat dissipation and helping to ensure excellent performance with Keystone solid reliability. With 3 field adjustable