The blue LEDs (450-470 nanometers) promote vegetative growth, leaf development, and greater flowering capacity. The white full-spectrum 15000K chips provide a balanced environment for your plants. Similar to other LED lights, this PAR38 Blue and White LED grow light runs much cooler than traditional lighting sources. Why LED for grow lights? LED grow lights are an increasingly popular choice for indoor plant growing and aquarium lighting. They deliver more intense light output with less energy and heat production. Compared to high pressure sodium, fluorescent, high-intensity discharge or incandescent lamps, they have a much longer life. This PAR38 Bulb fits in a standard fixture and requires no special ballasts or wiring. Reduce energy usage by 50% or more compared to HPS or MHS. Reduce grow room temperature by 15 degrees compared to HPS or MHS. Instant on, virtually no maintenance required.