This 5000K natural daylight bulb is non-dimmable and will replace 40-watt equivalent incandescent bulbs. It produces a similar light output (450 lumens), uses 5.5 watts of energy and up to 86% less energy than a standard incandescent light bulb. Get instant on to full brightness with relatively cool running performance. Feit Electric A19 bulbs have an average life of 11,000 hours/10 years are RoHS compliant and are 100% mercury free.