"20,000-hour average rated life. Brightness: 3,600 lumens. 50 watts. Bulb shape: B-17. Bulb base: Medium (E26). Size: 5-2/5""L x 2-1/8"" diameter. NOTE: high-pressure sodium ballast (ANSI Code S68) required for operation. Lights exterior and large interior spaces efficiently at an economical price. 6 bulbs per pack. For more on clean up a...