High pressure sodium HID lamp, E26 medium base, E17 bulb, universal burn, clear, 2100K, 9500 lumens, 24000 hours, 22 CRI. 1.12" arc length (28.4mm), 2.126 diameter. 5.43 MOL. 100 watt, 55 volts. Universal operating position, warm-up time 3-4 minutes.