GE Lighting 400 Watts Metal Halide HID Lamp, ED28, Mogul Screw (E39), 44,000 Lumens, 4000K Bulb Color Temp.

These HID and LED HID-replacement light bulbs have a mogul screw base, also called an E39 base. The E39 base has a 39mm diameter and screws into standard E39 sockets, which are typically found on enclosed fixtures. E39 mogul screw-base HID and LED HID-replacement bulbs produce a lot of light and are commonly installed in fixtures with a high mounting height, such as street lights, floodlights, and high-bay and low-bay lights in warehouses and convention centers.