Yield Lab 600w High Pressure Sodium (HPS) Digital HID Grow Light Bulb (2100K) &ndash; 1 Bulb &ndash; Hydroponic, Aeroponic, Horticulture Growing Equipment POWERFUL INTENSITY: These HPS lamps are essential for quality spectral and lumen output. Each 600w HPS bulb emits 90,000 lumens of yellow/orange/red light, plus 30% more blue spectrum than other bulbs on the market. SEE THE DIFFERENCE: These lights are designed and optimized for healthy and dense vegetative growth, and perfect for the flowering, blooming, and flushing stages. Increase your yields with less effort and fewer resources by choosing a lamp that will put in the most work for you. MULTIPURPOSE FUNCTIONALITY: All Yield Labs HID bulbs pass UL and CE testing, making them safe to use for indoor growing. Plus, they are compatible with both digital and magnetic ballasts and all standard E39 base sockets, so you can incorporate them seamlessly into whichever setup youre using. EFFICIENT OUTPUT: A red color temperature of 2100K is designed to increase fruiting and flowering volume up to 20% more than other bulbs on the market. SATISFACTION GUARANTEE: We are proud to be an industry leader in grow equipment and stand by our professional grade products. Thats why we can promise a lifespan of 24,000 hours and offer a 1 year warranty against manufacturer defects. Available in 400w, 600w and 1000w Operated and tested before packaging High Conductivity Contact Optimized for high performance and effeciency Long lifespan saves you money over cheaper brands CE and ETL Listed Compatible with most ballasts Higher PAR Effeciency than fluorecent lights Affordably priced