The I/V curve of nitride-based LED Flashlights is quite steep above the knee and gives an If of a few milliamperes at a Vf of 3 V, making it possible to power a nitride-based Cree LED Flashlights from a 3 V battery such as a coin cell without the need for a current limiting resistor.
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-- Edited by betterlin on Friday 27th of September 2013 09:01:23 AM