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Bright lights, big savings: LEDs arranged in the holes of the PVC mounting plate.

Photography by Charles Platt

MY LOVE AFFAIR WITH LEDS

Build a bright, low-powered desk lamp.

By Charles Platt

Quartz halogen lamps are more efficient than old-fashioned incandescent bulbs; fluorescents are more efficient than quartz halogens; and white light-emitting diodes (LEDs) are the most efficient of all (if you consider the ballast that is needed by fluorescents). So why haven’t white LEDs become as fashionable in homes as a Prius in the driveway?

One reason may be that a white LED isn’t quite white. It has an eerie purplish tint. This doesn’t seem to bother ...

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