I recently replaced a set of incandescent bulbs from the interior of my old car with some very inexpensive festoon LEDs. Unfortunately the LEDs are not 100% compatible with the lighting system as dimming is accomplished via pulsing the voltage signal. The pulsing effectively dims the incandescent bulb, but causes the LEDs to flicker/blink.
I think a quick solution to mitigate or eliminate the flicker is to solder a ceramic or film capacitor in parallel with the LED power supply terminals. However, I don't have access to a scope to measure the pulse frequency so I can't calculate an ideal capacitor value to use.
The bulbs run at 12V, draw ~250mA of current -- can someone suggest a safe range of capacitor values I can experiment with? Perhaps the frequency needs to be estimated for this question to make any sense.
I may also be able to emulate the resistance of the incandescent bulb with a resistor in series, but I don't want to lose the intensity that the LEDs are currently providing.