by ralph60 » Sat Aug 25, 2012 12:58 am
I ended up with LED bulbs as I struggled to find replacement bulbs at local motor factors. I searched on ebay for wedge bulbs and found there were LED replacements. T10 (10mm (roughly) measured across the base of the bulb) is the size for the tail lt and indicator. You can get various colours that you can put in the search. As mine is an RF1 and the rear lenses are clear I got coloured LEDs but you can get white also.
The stop/ tail are T20 or 7443 wedge, they work the same as a filament bulb.
LED bulbs work one way in the bulb holder so if it doesn't work when you first put the bulb in, turn it round and refit. Also the higher SMD means more light emmiting diodes, a more intense bulb. For instance if you searched 'T10 red 25SMD tail' that's a bright red tail lt. A 5SMD would only be any good for interior lighting.
I have found a 120 SMD T10 but only in white. I have wired my fog lt replacing my rh reverse lt (the import co put it on the wrong side) the red led I am using in it scraped through mot as it wasn't really bright enough. If anyone finds a 21w equivelant T10 red LED please let me know.
This isn't a concise breakdown about LED bulbs, just some of what I have found out when replacing blown bulbs, LEDs do look good as the colour is really intense and are long lasting.
Be aware that cars with a CAN system need the corresponding bulbs.
I hope this is of some help to you