Grower's Choice 10K 1000 Watt Double Ended MH BulbThe 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. Grower's Choice DE MH 10,000K 1000 Watt Bulb Features Outputs UV spectra for enhanced resin production 5% degradation rate at