There are three main categories of miniature single die LEDs: Low-current -- typically rated for 2 mA at around 2 V (approximately 4 mW consumption). Standard -- 20 mA LEDs at around 2 V (approximately 40 mW) for red, orange, yellow, and green, and 20 mA at 4-5 V (approximately 100 mW) for blue, violet, and white. Ultra-high-output -- 20 mA at approximately 2 V or 4-5 V, designed for viewing in direct sunlight. Five- and twelve-volt LEDs are ordinary miniature LEDs that incorporate a suitable series resistor for direct connection to a 5 V or 12 V supply.
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