LED resistor varies with color. They are connected in series so. One resistor connected per 4 LEDs [3 in case of white].
Finding the value is simple. First connect an LED to 3 V. Measure the voltage bw the LED leads [let it be V].
[ no. of LEDs per set x V ] + [current [I ]x resistor required [R]] = 12
current consumption per LED is 15 mA = I
let the voiltage dorp per LED be 2.8 V and set contains 4 LED
[4 x 2.8] + [0.015 x R] = 12
11.2 + 0.015 R = 12
R = [12-11.2]/0.015 = 53 ohm
Simple idea tell me the colors and number of LEDs used. I ll calculate for u.
8k is too too much.
First acquire old tail lamp set from some junk yard and do experiments on it. opening the taillamp is a bit tough job [in estilo at least]. Headlamp not much issue.
this forum will help, but gotta register in that forum HID PLanet