Mountain Biking - Modding a cheap Light....

I dont know how many electronics oriented people are in here but here it is. I have a cheapo cat eye 3 led light, i got it free with my bike. It currently is pretty bright but i think i could take it a bit farther. After taking it apart and looking at it i knew a mod could be easily done to it. Currently it has a 15 ohm resistor in it and im thinking of dropping that down to 10, by doing this it will raise the amps from .4 to .6....if anyone has any suggestions like say ummm mael i am very open to them, if the light dies or whatnot it is a minor loss due to it was free :)

Do LEDs emit more light with more amperage? I thought the light emission level was constant.

In any case, try wiring more batteries in parallel.

Don't know much about electronics, but here's a low-tech light that's worked very well for me -
Parts List:
Cheap 6 volt plastic lantern-type flashlight. Look for good weatherproof switch and decent reflector. Throw the rest away.
Small project box (Radio Shack)
Battery holder - 4 D cells (Radio Shack)
Coiled handset cord (from the phone in somebody else's cube)
2 small L-brackets (or thin aluminum stock) & velcro strap for mounting light to helmet

Remove reflector assembly from lantern, mount in front of project box. Remove switch from lantern & mount in top or side of box. Attach the aluminum or L-brackets to the back of the box and put velcro strap on the bottom leg to attach the whole thing to your helmet - bend the mount to the correct angle so that the light shines where you are looking when seated on your bike. Use your coworker's handset cord to connect the box (with the light and switch) to the battery holder - the idea is to have the light mounted on your helmet and the battery pack stashed in your Camelback or jersey pocket. Solder the electrical connections for best results. Look up simple switched circuits or get your neighbor with the old truck to help you wire it if necessary. Upgrade the light bulb to halogen or krypton as appropriate, waterproof the light as needed with black tape or RTV silicone, tweak, fine tune, improve, etc.
Not the sleekest or most fashionable rig out there, but it'll light up the trail as well as the $150 store-bought ones for a total investment of about $12. And with the proper gleam in your eye, everybody else will stay out of your way. Add a cateye or small maglight to your handlebar, aimed 5 ft in front of your wheel. Watch the look in the deer's eyes as you come bombing down the trail in the middle of their rush hour! Bonus points if you can slap one on the a$$!!
-R

Probably a better option would be to replace the LED's in it, with LED's with brighter output.

yah i realized that after a wile of thinking im not sure what mcd rating the leds are now but i doubt they make that much brighter . but leds will can take much more than there max rating before they pop. I have seen a 3 volt led run up to 12 before it popped. That is what made me decide against this all the led did with the extra power is change color. It was a green led and it had an orangish tint with the extra power kinda cool but oh well

whats a led

L ight E mitting D iode

Used in rear lights for bicycles and other light outputs (flashers on mobile phones, lights on T.V remotes)