In article
<72abbcaf-f30d-4a53-9860-75c856ac1923@8g2000hse.googlegroups.com>,

The lights on new cars are specially designed for LEDs. These so called
replacement LEDs for cars your age simply don't work as well as tungsten.
Try and find one which is 'E' marked as an allowable replacement.

Hello BMW owners,

I have 1999 323i, with regular bulb-lamps for its lights (headlights,
signal, tail lights).  I know there is an option to replace the
headlight with halogen -- but I was wondering, I see that there are
LED lights to replace regular bulbs for flash lights and some lamps
for home.  Is there any similar products for cars?  I don't think LED
is bright enough to use for headlights, but I think it can be used for
signal lights and taillights as new cars used these days.

The replacement LED lights I mentioned for home lights have the same
screw for the socket but just with LEDs.  So new LED lights can be
used without buying whole new one.  I was hoping to find similar
products for tail/signal lights for my car.

Does anyone know such products?

Thanks.