Sylvania MS320/PS/BU-HOR is a 320-watt Pulse Start MetalArc HID lamp designed for base-up, horizontal mounting in enclosed fixtures. It uses an ED28 envelope and an E39 Mogul base, delivering about 28,000 lumens at 4300 K with a CRI around 65 and a clear bulb. The lamp is rated for enclosed fixtures and is suited for high-output outdoor flood lighting and large indoor spaces that require bright, long-life illumination. Typical service life is approximately 15,000 hours.
