In 1992, bright blue LEDs made from GaN were invented by Shuji Nakamura in Japan. White LEDs were then made based on the technology used in blue LEDs.
LEDs have a high light to power effiency, up to 40LM/W. They are much more durable than conventional lightbulbs. The expected lifetime for LEDs is up to 100,000 hours. These advantages have made the LED flashlight popular.
The voltage to drive a LED is 3.0V to 3.6V. So a step up circuit should be used in LED flashlight using 1 or 2 1.5V dry battery.
Further reading Edit
- Shuji Nakamura, Gerhard Fasol, Stephen J. Pearton, The Blue Laser Diode : The Complete Story, Springer; 2nd edition, October 2, 2000, (ISBN 3540665056)
- UCSB Press release describing Shuji Nakamura's work
- Slide presentation about Shuji Nakamura's work
- The Advantages of LED Lights
- The Best LED Flashlights
- Superluminescent Light Emitting Diodes (SLEDs)
- LED Flashlight,Dynamo Flashlight,Shake Flashlight
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