Inspar8r

can anyone help me out with at least the PWM part???

Hey guys, new to the forum, and have a few technical questions. I recently designed a set of LED taillights, running 48 LEDs per side for my IS300. In order to increase the brightness, i would like to run the 5mm LEDs at PWM. The data sheets I have say the LEDs max pulse current is 100mA @ 10% duty cycle @1kHz. Where can I find the formulas or info needed to set up a 555 (i'm assuming this is the ideal IC) to gice me those specs. I plan on running 50 to 60mA, maybe more if i think i can get away with it. The second question, which seems to stump quite afew people, is the taillight failure sensor circuit inline with the tallights and brakelights. I'd rather not have 6