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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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bike lights
Making some bike lights for my daughter who rides her bicycle in
traffic in Brooklyn NY. I'm playing with some red Luxeon LED's, powered from 3 NiMH rechargable penlight cells. These suckers are seriously bright. I noted that the one I was running looked yellow (not red) from a distance of 100 feet -- but when I looked away for a bit and then looked back they looked red agan for an instant. WTF, over? When I walked back I noted that the spill on the table looked red. Geez, maybe I overloaded my red receptors? I turned down the current to 30% by soldering in another dropping resistor. Sure enough, it then looked red at 100 feet. Wondering why everything looks green now....... |
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