Most of us have had the annoying experience of the bulb failing in our flashlight, usually at a less than opportune moment. Even when there's a spare handy, changing it can be a challenge in the dark.?How appealing would you find a flashlight with a bulb that never burns out, or at least not for tens of thousands of hours?

Then there's battery life, or lack thereof.?If the bulb isn't failing, the batteries are petering out.?The light dims and is extinguished just about the time you need it the most.?Changing batteries in the dark, even when you have them, is usually a trial.?How appealing would you find a flashlight whose batteries last tens of hours, or even hundreds of hours?

LEDs
We're talking about LED Flashlights that use LEDs (Light Emitting Diodes) instead of conventional incandescent bulbs. Yes, these are the same LEDs you've seen in electronic equipment, digital signs, cheap key ring lights, and the like for years.?The problem has been that while LEDs came in an array of colors, they didn't come in white--until very recently.?Other colors might suffice to light up a keyhole or to read a chart without diminishing your night vision, but for general practical use they left a good deal to be desired. Some have tried using a mixture of primary colors, with varying effectiveness, but that's not exactly an elegant solution.

In the early 1990s Shuji Nakamura of Nichia Chemical (now Nichia America) developed the first viable white LED (Read: about his significant accomplishments in this a related fields as well as a fascinating interview about his battles to develop this and other ground breaking devices in a Scientific American interview).?Actually, the term hite LED?is not technically correct.?The LED itself generates blue light, but a micro-thin coating fluoresces when struck by the blue light, generating a white light.

In part because of this two-stage process, initial examples were pretty dim.?They were also very expensive, as with most newly developed technologies. ecently they have been getting brighter and brighter and, if not inexpensive, at least much more affordable. While still far dimmer than other LEDs of comparable size and energy use, they are bright enough to make a white LED Flashlight practical, at least for some uses. Brightness is also a function of the beam angle built into the LED's integral reflector. The advent of narrow angle (20 degrees) LEDs has also made a big difference in usability.

Not all white LEDs are equal. When they produce LEDs, and especially white LEDs, there is considerable variability among them, both in terms of brightness and the actual color, a problem that was at times very evident in our tests. Like pearls, LEDs are graded and can be matched, in this case for output and color. One fallout from this has been that the brighter and whiter you want them, and the better color matched they are if more than one, the more expensive these LEDs are.?That translates to a more expensive end product.

In any case, the bluish white color is far different than that from a typical incandescent bulb. No matter what type incandescent it is, there is a yellow cast to the color, to one degree or another. The white LEDs' color is far closer to that of natural sunlight, thus colors are rendered more naturally. However, some find this color nnatural?since it's so different from what they are used to from a conventional bulb. It can take a while to get comfortable with the color.

The news come from www.bossgoo.com

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