Growers Choice 1,000 Watt Double-Ended Metal Halide Bulb, 10,000KThe Grower's Choice 10K bulb is for growers who are looking to maximize yield and resin production, making it suitable for the last 7 14 days of flowering. The 10K contains UV B light, which is widely known to increase resin production, as the plant forms its own kind of "sunscreen" to protect itself from the ultraviolet light. Outputs UV spectra for enhanced resin production 5% degradation rate at 10,000 hours High quality quartz glass for consistent