What makes Earth Worth bulbs special? Quality and Performance! Earth Worth only supplies the highest quality hydroponic bulbs and systems. We have searched the world over and partnered with a factory which utilizes the most advanced lighting components which results in a high performance, long lasting, and versatile HPS bulbs that will yield superior crops and be around for years to come. The EW-400HPS bulb is constructed of the highest quality electronics to exacting quality control standards to ensure you years of trouble free service. Our HPS bulbs are photometrically designed to contain more red spectrum light--this is best for flowering. In addition, the high performance light is strong enough to penetrate fog and has anti-insect properties. Earth Worth hydroponic products are created by growers FOR growers. And we stand behind every product we sell 100%. What is Included: 400W High Pressure Sodium (HPS) Bulb. Specifications: Power: 400 watts (High efficiency). Rated Life: 24,000 hours. Lumens: 50,000 lumens. Color Temperature: 2,100K. Strong power to penetrate fog. High output, high luminescence efficiency. Fits all standard 400 watts HPS grow light systems. Earth Worth HPS bulbs are designed to grow healthy, high producing plants across each phase of their growth cycle. Research shows that Earth Worth spectral energy ratios have far more influence on plant growth than lumens. You can trust Earth Worth HPS bulbs to deliver the proper spectrum at just the right luminocity to grow year around. Features: Revolutionizes lighting for plant growth! Designed to provide a fully balanced light spectrum that replicates natural sunlight. Used professionally in plant physiological research, and biotechnology/pharmacology industries.