Just dug my old Lumis out for commute duties, and wondered if there was a ‘drop in’ unit to convert to LED?
There’s shed loads of info on this site that’ll take some trawling so I thought I’d ask.
Plus because I just go to the shop for my lights I’m behind on the terminology.

for comuting yes ok to be seen by but not to see by diffuse weak beams

Do make sure that they will work from batteries – some seem to need t12 v ac

I have not tried any but perhaps one of these?
http://www.ultraleds.co.uk/mr11-35mm-c-100_146.html