Virtual Sun VS600HPS 600-Watt HPS Grow Light Blub High power 600-watts (hps) bulb - 90,000 lumens high output - color temperature: 2,100k Average life span 20,000 to 24,000 hours Hps bulb give out 10% more light than standard bulb - 10% increase of light output = 10 % more plant growth 30% more blue/violet provides better range for your plant Fits all standard 600 watts hps grow light systems