When shopping for flashlights you may have seen lights that say they have a Cree LED. Cree is a North Carolina-based LED manufacturer that creates all sorts of lighting. They are not in to developing flashlights, but they supply what looks like an integrated circuit chip that is actually a little LED (light emitting diode).
These little chips output more light than you would imagine from such a small package, but they don’t consume as much power as you would think something that bright would use. Cree LEDs enable flashlight manufacturers to create very small flashlights that output as much or more light than large traditional flashlights you are used to. For instance, a standard incandescent 2-D cell flashlight puts out around 9-35 lumens of light. Cree LEDs typically put out anywhere between 100-1000 lumens.