This 4-pack of T5 21-inch LED F13T5WW LED Replacement Bulbs is the perfect energy-saving solution for under-cabinet lights. With 9 watts and 920 lumens of warm white light at 3000K, these bulbs are a direct replacement for 13-watt T5 tubes and can save you over 50% in energy costs. Compatible with most ballasts, these bulbs are easy to install and have an average life of 25,000 hours. Plus, they are a safe alternative to fluorescent and CFL bulbs, as they do not contain mercury and won't release any hazardous gases. Enjoy the natural warm lighting of these F13T5WW bulbs with a CRI of 90 and ultra-bright color at 3000K.