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Originally Posted by tribble
Anone know, where to get a USB Lamp with an LED that uses little power and has large light emission.
The best i found so far is an LED, warm white, 12000mcd, 18mA, 20°, 5mm, 3.4V.
But thats not attached to anything yet.
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Hey, Tribble,
try Googling "LED USB light" you'll find a good selection, and you can find someplace that's convenient for you. They seem to average 10~12 USD. You also might find them at your local computer/office supply store. If all else fails,
Amazon seems to have them.
Nearly as I can tell, these lights are going to draw around 30 mA (the packaging may tell you more on that, but it may not -- lower mA is better!), which is not much. The real question is how much battery capacity the iLiad has, and what effect that extra draw will have on its life.
As a theoretical exercise, a 30 mA draw on, say, a 600 mAh battery will drain that battery in
approximately 20 hours. Of course that doesn't count the juice to change pages, or access files, etc. (and we don't know the iLiad's battery's capacity, for that matter), but it does
suggest that you might be able to get through an evening's reading by one of these lights without totally draining your battery.
I'm guessing that anything designed for lighting up a laptop's (usually dark colored) keyboard ought to be plenty bright for reading the iLiad's much smaller, lighter colored screen.
Another thing -- I realize that Laptops have really big, honkin' batteries compared to the iLiad, but I don't think a USB keyboard light that had a heavy power draw would work very well for laptops either, so that, again, suggests that we may have a workable solution.