Plusrite 1524 1000W - BT56-P - Pulse Start - Metal Halide - Protected Arc Tube - 4200K - Mogul Base - ANSI M141/O - Base Up Burn - MP1000/BT56/PS/BU/4K Plusrite USA produces and carries a variety of quality products in the Lighting industry Plusrite brand bulbs for great performance Our products are high quality, reliable and durable, Clear