Quite by accident the other day, I came across a solution to my light problem. I have vintage lights on my '72 Raleigh and have been trying to figure out how to upgrade them to halogen or led etc.
The problem is they have screw base bulb holders. I tried Radio Shack for better bulbs or a bulb holder for flanged bulbs. No success. Remember, if you try to convert care must be given because if you screw up the reflector you may as well toss the light and the internal clearances inside the lamp are tight.
I came across this bulb which screws right in and is a led bulb 2v to 9v capacity. It is the Terralux tle-1s. The "s" stands for screw base. They also make a tle-1f which stands for flange base.
I quickly ordered one, about $20 with shipping. Tried it out last night. The difference was unbelieveable. Night and day.
This bulb is discontinued but they are out there. Just Google the model number.
I hope this helps you guys using vintage lamps who have lighting problems and don't know what to do. This bad boy just screws right in to your vintage lamp.
I am indeed a happy camper!
PS I just thought I would share this info