About 10 years ago we saw a handlebar brace bracket with a built in LED bike light. The one side of the clamp was machined with a threaded end cap; this allowed 3pcs of AAA batteries to discreetly fit inside the handlebar brace tube. A genius way to have bike lights hidden discreetly (out of harms way) and also make them theft resistant.
|Handlebar brace with built in LED light, runs on AAA batteries|
It was a folding bike store and this might have been a custom lit handlebar brace for a pair of Brompton folding bike handlebars.