How to Calculate LED Power Calculating the power used by light-emitting diodes, or LEDs, can be an important part of any electronics project -- particularly when deciding how many batteries you may need. To determine an LED's power requirements, you need to know how much current flows through the LED and its voltage. Once you have this information, you can multiply the current by the voltage to determine the LED's power requirement. Instructions 1 Determine the LED forward voltage. Look at the manufacturer's data sheet and find the specification for the typical forward voltage. This is a close approximation to the voltage across the diode. Alternatively, measure the voltage drop across the LED when it is lit with a voltmeter. Otherwise, just estimate the forward voltage based on the color of the LED. Use 1.8 volts for a red LED, 3.5 volts for a white LED, 3.6 volts for a blue LED and 2.1 volts for a green, orange or yellow LED. 2 Determine the electrical current flowing through the LED. Look at the manufacturer's data sheet and find the typical electrical current associated with the typical forward voltage. This electrical current is a close approximation to the current through the diode. Alternatively, measure the electrical current through the LED with an ammeter if you want an exact value. Otherwise, just roughly estimate that the current through the LED is around 20 milliamperes. 3 Calculate the LED power. Multiply the voltage across the LED by the current through the LED. For example, for an LED that has typical forward voltage of 2.1 volts with an associated typical current of 20 milliamperes, calculate that the LED power is 42 milliwatts, since 2.1 multiplied by 0.02 is 0.042. Remember that power in watts is equal to current in amperes multiplied by voltage in volts, and that 1000 milliwatts is equal to one watt and 1000 milliamperes is equal to 1 ampere. dm8000 hd wholesale led light usb flash drive usb flash drive wholesale usb flash drive flash drive manufacturer led lighting LED Wall Wash light LED video pixels LED Digital Tube light LED Spot Light LED Point Light LED Under-ground Lighting LED Commerical Lighting LED ba?ador de pared LED píxel de luz Tubos LED luz llevada del punto LED punto de Luz lenovo cellphone LED Spotlights Buried LED Iluminación Comercial ????? ????? ??? ????? ???????????? ????? ???????? ???????????? ?????? Power supply for DM500C DM500S DM500T Remote control for DM600PVR DM7000 DM7020S DM7025 Power Supply for DM600PVR DM7000 DM7020S DM7025 dm8000 hd dreambox dm8000 dm 8000 hd dreambox 8000 dreambox dm7020 dm7020 HD dreambox 7020 dm7020 HD dreambox 7020 Dreambox dm800 HD Se dm800 hd se with Wifi dm800 hd pvr dreambox dm800 hd pvr cheap dreambox dm800 hd pvr http://www.dreamboxok.com/dm500si.html Dreambox dm500S satellite receiver http://www.dreamboxok.com/Dreambox-DM-500-S.html DreamboxDM 500 OEM http://www.dreamboxok.com/DM500-OEM.htm Dreambox DM500C http://www.dreamboxok.com/Dreambox-DM-500-C.html Dreambox DM500C OEM http://www.dreamboxok.com/dm500c-oem.html Dreambox DM500S OEM http://www.dreamboxok.com/dm500s-oem.html Dreambox DM500Si Silver http://www.dreamboxs.com/dm500si.htm Dreambox dm500Si black http://www.dreamboxok.com/dm500si-black.htm Dreambox dm 518S http://www.dreamboxs.com/dreambox-dm518s.html Dreambox DM500T http://www.dreamboxok.com/Dreambox-DM-500-T.html AzBox HD Elite
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