2 Foot U Shaped LED Tube Lights 18W Replaces 40W Fluorescent 5000K Clear Instant on, glare-free Flicker-free, silentno ballast Consume less energy (18 Watts vs. 40 Watts) Emit less heat (3.4 BTU/hr vs. 30 BTU/hr) No mercury or other hazardous materials Approx. 8 year lifespan (6 hrs/day, 7 days/wk usage) Durable aluminum and plastic construction