This Replacement for Sylvania HQI-SE400/DX is a 400W metal halide HID lamp designed for high-quality, daylight-balanced illumination in commercial and industrial applications. Featuring an E40 mogul base and T14 clear glass bulb, it installs easily into compatible fixtures using an S51/E ballast system. Delivering approximately 33,000 lumens of 5200K daylight white light with a high 90 CRI, this lamp provides excellent color rendering and bright, natural-looking illumination ideal for retail spaces, showrooms, stadiums, and architectural lighting applications. Its universal burn position allows flexible installation in a variety of fixture orientations. With a rated life of up to 9,000 hours, this HID replacement bulb offers reliable performance, accurate color quality, and consistent high-output lighting for demanding environments.