I have a similar issue and found this in exploring possible solutions: http://www.whitegauges.net/products/WHITE-4-point-194-style-LED-replacement-bulb.html#

Some LEDs would be ideal in this lighting environment, I think. I haven't tried these yet and im not sure if they fit or you have to modify some stuff, or if there are better ones. But I found them from a guys video on youtube, looked nice, compared to my current look of constantly driving under a street lamp. Let me know if you decide to try them, or if anyone else has.