Eye Hortilux Blue Daylight Super MH Lamp - 400W Horizontal direct from Growers House
Hortilux Blue (Daylight) Super Metal Halide (MH) Lamp, 400W - GreenLightsDirect
M400ML5AC4M500K - Core and Coil Ballast for 400W Metal Halide Lamp 120V to 480V unlimitedlights.com
Feit Electric 400-Watt ED28 Shape Clear Metal Halide High Intensity Discharge E39 Mogul Base HID Light Bulb (1-Bulb) MH400/U/ED28/HDRP - The Home Depot
LED 400W Metal Halide Replacement Corn Bulbs - 80 Watt, 5000K - Mogul Base; 100-277 volts
Philips 274498 | MH400/U | 400W M59/E Metal Halide
Westinghouse Lighting 400W E39/Mogul LED Light Bulb | Wayfair
Ushio UMH-400/U, ED28 Metal Halide Lamp (400W/4000K/ED28)