400W High Pressure Sodium Bulb: Power: 400 watts (High efficiency) Expected Life Span: 24,000 hours Lumen: 50,000 lumens Color Temperature: 2,100K 400W Metal Halide Bulb: Power: 400W (High efficiency) Expected Life Span: 10,000 hours Lumen: 36,000 lumens Color Temperature: 4,200K 400W Digital Electronic Ballast: High power 400 watts. Built-in standard reflector interface. Fit for 400 watts High Pressure Sodium Lamps or 400 watts Metal Halide Lamps. Pass FCC and CE Certificate. 2-in-1 Cool Tube Hood Reflector: Multi-surface large hood to reflect most light to your plants. Better air cooling than other general reflector hoods. Overall Dimensions: 31in.(L) x 25in. (W) x 8in.(H) Ceramic Socket: Fit for E39 bulb cap Detachable durable ceramic socket Easy to install if you need to change your... Less

PHILIPS 400 watt ED18 E39 MasterColor HPS Retro White HPS lamp S51/M169/OPhilips MasterColor Ceramic Metal Halide HPS-RetroWhite Lamps are designed as a retrofit for HPS lampsFeatures:- Operates on standard HPS ballasts.- Rated average life of 20,000 hours* for both vertical (250W & 400W) and horizontal (250W) operation.- Excellent color stability, CRI, and 80% lumen maintenance- stays brighter longer.- No shut off required- ideal for 24-hour a day, 7-day a week operations (relamp fixtures at or before the end of rated life)- Patented coil design offers protection for open fixture rating.- Uses ALTO LampTechnology. ApplicationsIdeal for indoor and outdoor applications of industrial facilities and warehouses.