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LED power dissipation is modeled as a current source; thermal resistance is modeled as a resistor; and the ambient temperature is modeled as a voltage source. High power light-emitting diodes (LEDs) can use 350 milliwatts or more in a single LED. Most of the electricity in an LED becomes heat rather than light (about 70% heat and 30% light).
Efficiency: LEDs emit more lumens per watt than incandescent light bulbs. [169] The efficiency of LED lighting fixtures is not affected by shape and size, unlike fluorescent light bulbs or tubes. Size: LEDs can be very small (smaller than 2 mm 2 [170]) and are easily attached to printed circuit boards.
A 230-volt LED filament lamp, with an E27 base. The filaments are visible as the eight yellow vertical lines. An assortment of LED lamps commercially available in 2010: floodlight fixtures (left), reading light (center), household lamps (center right and bottom), and low-power accent light (right) applications An 80W Chips on board (COB) LED module from an industrial light luminaire, thermally ...
WP3.3×14.5-1 1 12 V: 19 W ANSI № 7446 PWR19W WP3.3×14.5-5 1 12 V: 19 W Red PWY19W WP3.3×14.5-2 1 12 V: 19 W Amber, ANSI № 7449 P21W BA15s 1 6 V, 12 V, 24 V: 21 W ECE nominal luminous flux: 460lm ± 15% Old designation: P25-1 PR21W BAW15s 1 12 V & 24 V: 21 W Red PY21W BAU15s 1 12 V & 24 V: 21 W Amber ECE nominal luminous flux: 280 lm ±20%
Color temperature is a parameter describing the color of a visible light source by comparing it to the color of light emitted by an idealized opaque, non-reflective body. The temperature of the ideal emitter that matches the color most closely is defined as the color temperature of the original visible light source.
An LED begins to emit light when more than 2 or 3 volts is applied in the forward direction. The reverse bias region uses a different vertical scale from the forward bias region to show that the leakage current is nearly constant with voltage until breakdown occurs. In forward bias, the current starts small but increases exponentially with voltage.
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