These lamps are designed for imaging and are intended for use only with the Lowel Ego. They are 5500deg. K (daylight) color temperature, with a CRI (color rendering index) of 90+. Each lamp is 27 Watts, with an output roughly equivalent to a 100 Watt standard incandescent light bulb. Lowel rates life at 5,000 to 10,000 hours. Instant start, flicker free. NOT DIMMABLE.