Elfin Growth Hydroponic High PAR Enhanced Red and Orange Spectrums 600 Watt Flowering High Pressure Sodium HPS Grow Light Bulb Lamp Ultra Bright 90,000 Lumens Optimized spectrum and high PAR (Photosynthetic Active Radiation) to promote healthy plant growth. Lifetime: 20,000 hours/ 2.3 years. Extra-low lumen depreciation: maintaining over 90% of initial lumen output after running for 5,000 hours. 600w HPS bulb, welcome guide, and friendly customer service. The most reliable grow lamp on the market - 1 million+ happy users and counting.