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Widerstandsberechner/link "," "," a typical color measurement of white and warm light is indicated by LED lamps with Kelvin degree (k). The coloured LED lamps are measured on the contrary with wavelength and indicated: "," a blue LED usually has: 455-470nm, Green: 525-571nm, Yellow: 580,-595, Orange: 606-625, red: 624-633, dark red: 639-643. The color "," ElectroDroid, download at Heise "," description of Resistors "," resistor 120 ohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a pre-resistor is required for each LED. "," resistor value 120 ohm "," operation of the LED up to 4.5 V DC or alternating voltage "," resistor 270 ohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 270 ohm ","Operation of the LED up to 7.0 V DC or alternating voltage "," resistor 470 ohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 470 ohm ","Operation of the LED up to 10 V DC or alternating voltage "," resistor 680 ohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 680 ohm ","Operation of the LED up to 13 V DC or alternating voltage "," resistor 820 ohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 820 ohm ","Operation of the LED up to 16 V DC or alternating voltage "," Resistor 1.0 kohm "," in order to operate LEDs at a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 1 Kohm "," Operation of the LED up to 20 V or alternating voltage "," resistor 1.2 kohm "," in order to operate LED's to a higher voltage, a pre-resistor must usually be upstream. "," a resistor is required for each led. "," resistor value 1.2 kohm "," Operation of the LED up to 24 V DC or alternating voltage