a cone of light with half-power points about 60° from the axis. A laser diode and an LED are both semiconductor light sources, but laser diodes rely on stimulated emission, whereas LEDs use spontaneous emission.

White light LEDs

General-purpose lighting requires a white light, emulating a black body at a specified temperature, from "warm white" (like an incandescent bulb) at 2700K, to "daylight" at around 6500K. The first LEDs emitted light in a very narrow band

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