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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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OT, Sorta-LED flashlights...
Hi all,
I know this is not strictly on topic, but this crew seems to know something about everythig, so here goes: I am looking to build a "task" lamp (think dentist-type light) that uses high output white LEDs for a friend who often does work for extended periods of time in very remote places. I was looking at the NTE electronics "lightwave" flashlights http://www.nteinc.com/lightwave/ and they claim that they have circuitry that makes it possible to run one of the 10 led lights for 24 days, continuously, on 3 D cells. Any idea how they accomplish that? Most of the high output LEDs I have seen seem to want to run between 20 and 40 mA current draw. Given the amp-hour ratings I find for D cells, I don't see how that would work out. Do they modulate the power to the LEDs in some way that helps extend the battery life so dramatically? I looked at just modifing a lightwave flashlight for the task at hand, but the beam is a bit too wide for what he needs. So I am hoping to build something with maybe 3 LEDs and appropriate optics to give a fairly narrow, even beam, mounted on a gooseneck type thing, with a remote battery pack on a cord. Any thoughts on the electronics involved? I can handle that part of it, if I know what I am trying to accomplish.Of course the body of the thing will be METAL, nicely turned, naturally. (obligatory metalworking content...) Thanks for any ideas you can offer. -AL |
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