This Cree A19-40W-50K-U1 is an LED A19 lamp that uses 5 watts equivalent to a 40 watt incandescent.
Better light is beautiful light. The A19 Series is part of Cree's new and improved LED lamp family and features a remarkable combination of comfortable omnidirectional light, high color rendering, instant-on, and quiet dimming. Even better, the A19 lamp is incredibly efficient, lasts up to 6 times longer than other LED bulbs, and provides up to 88% energy savings compared to incandescent.