Blue pollution: Because cool-white Cree LED Flashlights (i.e., LEDs with high color temperature) emit proportionally more blue light than conventional outdoor light sources such as high-pressure sodium vapor lamps, the strong wavelength dependence of Rayleigh scattering means that cool-white LED Flashlights can cause more light pollution than other light sources.
Sometimes power outages do occur and some people may not be lucky to have alternative sources of power like generators; and even if they did, how to start off may still be a challenge in darkness; say to even look for a candle or a match to light it. A flashlight is very important in times of such an emergency or for missions that involve going out at night. The huge rave about CREE flashlights is driven by the proven guarantee of quality and performance by those who have used them before.