nicko42004200
Newly Enlightened
- Joined
- Jul 27, 2012
- Messages
- 67
I built a t6 6 volt old school flashlight. Used at first 4aa nimh batteries with a 1 ohm 10w resistor . Vf was 3.1 at led. Pulled 1.25 amps . Switched to 8 aa's and getting 3.18 volts and 2.80 amps. Light is bright . With the online led resistor calculators the 1 ohm was what it said to get 3.5 fv 3.0 amps off of 5.6 volts (4aa) batteries. Why are my numbers so off from the calculator? I used 18 gauge auto wires, short lengths to keep resistance to a minimum. I just don't get it. Are my numbers good. Or can I change the resistor to get more out of it. Resistor get real hot even on a video card cooler. Led gets hot but not as bad as resister. Led is on a Northridge heatsink for now. Thanks in advance for your help.
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