This article can provide you with all the information you need on LED’s and the office desk lamps that use them. Very few people actually know why LED’s are so important or what they really are. LED stands for light emitting diode. They have been used for quite a long time to create small sources of light for a variety…
Today’s 5-chip LEDs claim a spread of 60°. I opted for a 12V DC power supply, to make the small desk lamp function in motor homes, where LEDs are ideal to conserve power. For use with 115V AC, you need an adapter that delivers 12V DC at 1 amp. Instead of adding a series resistor with each LED, the most efficient way to power them from 12V DC is by series-wiring them in threes. This means you need 10V DC for each set. How to get 10V from 12V power? Pulse-width modulation is the way to go.
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