For use with OTT-LITE Floor Lamps (010-F-OTT). OTT-LITE TrueColor tubes are specially formulated to be the closest thing to natural daylight. Low heat, low glare natural daylight illumination. Read and see tiny details with reduced eyestrain. Rated to last up to 10,000 hours. (lamp OLF018TC - bulb OLPL18TC).