The LU1000/ED37 is a high-intensity discharge (HID) 1000-Watt High Pressure Sodium (HPS) light bulb built with a large ED37 shape and a heavy-duty Mogul (E39) screw base. These powerful industrial bulbs require a compatible S52 ballast to safely operate. They generate an intense amber-orange glow of about 2000K to 2100K color temperature and emit an incredibly bright output of roughly 125,000 to 127,000 lumens, making them ideal for spaces like warehouses, streetlights, and large outdoor areas.