To be installed by licensed electrician only. Requires non-shunted lamp holders (tombstones). See part no. SOCK-L13051U. Do not use with dimmers. The ETi 54104431 18-watt LED integral tube offers exceptional LED lighting, while reducing energy and maintenance cost. It has a warm white color temperature of 3500K and will last up to 50,000 hours. This linear LED tube is a high quality replacement for conventional fluorescent lamps.