40 Watt Equivalent ST64 LED Dimmable Light Bulb Warm White (2700k) E26/medium (standard) Base to feature an incandescent bulb shape that you have come to know and love, and they consume up to 88% less electricity compared to your standard incandescent bulb. Not only is the Emark bulb energy efficient, but since the LED bulb does not produce heat similar to an incandescent or fluorescent bulb, you end up saving more on electricity with less use of the air condition.