The TCP 28927-41 SpringLamp CFLs feature Amalgam Technology which provides cooler operating temperatures for consistent performance in any position. This 27-watt bulb from the 289 series will fit in applications where incandescent bulbs currently exist or would be considered. Featured advantages include outstanding energy efficiencies, 10,000 average life hours, brilliant cool white 4100K color temperature, excellent color rendering, flicker-free instant start, and a 18-month warranty. Please note: This bulb is not for use in enclosed fixtures. Use only in open, ventilated fixtures.