Available in 18W with 6500K color temperature, this 4ft. LED tube is equivalent to a 50W fluorescent tube of T8, T10, and T12 types. By switching from any of these fluorescent tubes of 50W to our 18W LED tube, there is a significant amount of energy-saving -- 32W in this case. By so saving energy, you bring to yourself a lower than usual utility bill not just today and tomorrow but throughout the year. This product is also tested rigorously for heat dissipation to improve the lifespan -- about 4-5 times longer than the fluorescent tubes. The product is coated with polycarbide to provide it with the necessary durability. This product can deliver lumens up to 1800 and is bright enough for standard height ceilings. This 18W 4ft. LED Tube can work only with ballast so you must check with the manufacturer for their “ballast compatibility” list. As UL listed product.