Recent content by ineedsomephys

Ok I'll probably just go with a bigger LED then. What would make for a bright light (it'll be used mostly for working under cars from about 1-3 feet away, so a big spread would be better, probably like 30 degrees I think) So I was thinking maybe a .5 A light? Thanks for your input!

Thank you! It is actually a Kawasaki battery powered flashlight, but I don't think it has a xenon bulb (it has a fillament). Either way, I'm sure it wouldn't be too hard to find one, I just thought this would be a good opportunity to try to do a little science project and see if I could...

Yeah you're right. I tried it with 1k Ohm and it looks like even with 800 Ohms it will probably be much too dim. So do flashlights designed to use LEDs have lower voltages then? It seems like there is no way to have a high voltage powering an LED without losing a lot of efficiency. Is there a...

Ok so I have a flashlight that is 19.2 volts. It used to have a bulb that was 19.2 volts and .6 amps, but I broke it, and couldn't find a replacement, so I decided to try to use an LED and a resistor. The LED is 20 mA (.02 Amps) and 3.5 Volts. If I am correct, to find the resistor I need I would...