Apollo Horticulture GLBHPS600 600 - Watt High Pressure Sodium HPS Grow Light Bulb Lamp E39 Base 600 Watt Apollo Brand HPS bulb compatible with electronic and magnetic ballasts (87,000 Lumen) High Pressure Sodium's Light Spectrum Stimulates Flower Growth and enhances Fruiting 2000K Red-Orange Spectrum, Designed specifically for Professional Hydroponic Plant Cultivation Expected Bulb Life: 24,000 Hours Improved Lamp Life and Lumen Output, 110V power voltage Startup Time: 10secs allow 3-5mins for full Warm up. Please wait at least 5mins after power shut off before striking again.