L.E.D.

This is from NY Times:

When the Sentry Equipment Corporation in Oconomowoc, Wis., was considering how to light its new factory last year, the company’s president, Michael Farrell, decided to try something new: light emitting diodes, or L.E.D.’s.

“I knew L.E.D.’s were used in stoplights. I wondered why they can’t be used in buildings,” Mr. Farrell said. “So I went on a mission.”

What Mr. Farrell found was a light source that many of the biggest bulb manufacturers are now convinced will supplant incandescent bulbs and compact fluorescent bulbs.
By lighting all of the building’s exterior and most of its interior with L.E.D.’s, Sentry spent $12,000 more than the $6,000 needed to light the facility with a mixture of incandescent and fluorescent bulbs. But using L.E.D.’s, the company is saving $7,000 a year in energy costs, will not need to change a bulb for 20 years and will recoup its additional investment in less than two years.

“I’d do it again,” Mr. Farrell said. “It was a no-brainer.”

L.E.D. bulbs, with their brighter light and longer life, have already replaced standard bulbs in many of the nation’s traffic lights. Indeed, the red, green and yellow signals are — aside from the tiny blinking red light on a DVD player, a cellphone or another electronic device — probably the most familiar application of the technology.

Read the rest here.