PacLights Plus40 Extra Bright LED Light Bulb, 4-watt, Warm White, 40w Replacement, 50w Equivalent (450 lumens), E26 Medium Base A19, UL Listed Replace 40W-50W Incandescent bulb by 4W LED, Save Over 90% Energy MCOB - 4th Generation LED Technology; Less Energy, Extra Bright - Over 100 lm / watt Lumen Output Beats Any 40w Equiv. 2nd Generation (SMD) LED Bulbs on Market UL Listed, IC Driver ensures 40,000 Hours Lifespan, Power Factor &gt; 0.8 Performance without Compromise, Brighter than Regular 40w, Close to 50w