An individual white LED (light-emitting diode) has anefficiency of 20% and uses

Question

An individual white LED (light-emitting diode) has anefficiency of 20% and uses 1.0 W of electric power. a) How many LEDs must be combined into one light sourceto give a total of 1.6 W of visible-light output (comparableto the light output of a 40 W incandescent bulb)? b) What total power is necessary to run this LED lightsource? An individual white LED (light-emitting diode) has anefficiency of 20% and uses 1.0 W of electric power. a) How many LEDs must be combined into one light sourceto give a total of 1.6 W of visible-light output (comparableto the light output of a 40 W incandescent bulb)? b) What total power is necessary to run this LED lightsource?

Explanation / Answer

. Problem statement: An individual white LED(light-emitting diode) has an efficiency of 20% and uses 1.0 Wof electric power.
a) How many LEDs must be combined into one light source togive a total of 1.6 W of visible-light output (comparable tothe light output of a 40 W incandescent bulb)?
b) What total power is necessary to run this LED lightsource? . 01.   Each LED is emitting 0.2 Watts of light forevery 1.0 Watts consumed (20.0%). 02.   Quantity = (1.6 Watts)/(0.2 Watts/LED) =8 LEDs 03.   Power = (8 LEDs)*(1.0 Watts/LED) =8.0 Watts .

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