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 54108161 18-watt LED integral tube offers exceptional LED lighting, while reducing energy and maintenance costs. It has a stark white color temperature of 5000K and will last up to 50,000 hours. This linear LED tube is a high quality replacement for conventional 32-watt fluorescent lamps.