anyone installed a voltage regulator to run lights off the magneto?

I installed a homemade headlight that is pretty darn bright, and defintely worth the $10 i spent on it lol. but I have only used it a few times, and i have already blown one bulb. its a 50 led light (49 led now lol), so one blown bulb wont kill it, but too many more might. I am not really sure if the bulb blew due to overloading or vibration, but a regulator would solve one of those issues. the closest electronic store to me is radio shack, can anyone tell me what parts to buy at radio shack and possibly provide links to them? thank you.

Im gonna run my headlight off batteries till next month when I can get a headlight with a built-in regulator.

actually, im ordering a light from the wonderful creations store on ebay that has a built-in regulator. its 2 super bright led's, and its about 270 lumens. the light im using now is 150 lumens and still plenty bright for my needs, so 270 lumens will be more than enough. the light is $17 plus 5 for shipping.

lol my light was bright enough to go full speed down a road with no street lights last night, and the light im getting is almost twice as bright as the one I have now.