Low Power Consumption- Environmentally friendly growlight solution requires no additional cooling. Small T5 tubes create BIG OUTPUT! 2,000 initial lumen output- 54 watt day or warm spectrum. Rated 20,000 hour life. For 2 Foot fixtures. Choose Blue spectrum below. Choose all blue for leafy non fruiting and flowering or all red for non leafy, fruiting and flowering plants or mix blue and red for full spectrum.