More of an update to an existing set really.
I've got a pair of quad xp-g r5s (1480 lumens each) that did have an external switch/controller housing which mounted to the stem. A new frame (and shorter stem) meant the old switch units had to go. So... I added a bar mounted box and stuck in another LED, for no good reason other than I could (the selection criteria being that the LED was oblong).
This is a 7W COB (540 lumen):

This is the the complete unit (6 degree lens on the COB and 23 on the quads):

And some beam shots (base on the old MTBR standard but ISO/shutter balanced to avoid a tripod).
Base:

COB only:

One of the quads:

Everything:

And for rerence...
P7 with 15 degree optic:

Twin xp-g with 10 degree optics:

