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In 1992, bright blue LED s 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
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