This HID tubular metal halide light bulb offers an incredibly bright white light that can be used in closed luminaires in large commercial and industrial spaces.It is ideal for use in commercial floodlights. Fitted with a GES-E40 Goliath Edison screw (40mm) cap (sometimes known as a giant screw cap).The 250W light bulb emits an outstanding 21400 lumens of cool white 4100K light, and has an impressive A energy rating. Its long 10,000 hour life rivals many equivalent LED floodlights. The light bulb has an E40 giant Edison screw (GES) cap and universal operating position, so is compatible with many standard fittings.This discharge light bulb provides up to ten hours of light per start, with a one minute warm up time. It requires an external ignitor. For more details, please see the manufacturer\'s website.Please note, this light bulb is not suitable for dimming.For use in closed luminaries. Universal operating position.