I´ve been six years using this lip mike light...
Seitz ML15 Lip Mike Lite
The xenon bulb is valid for an exterior inspection but consumes much battery life... better use the h/c torch.
The red bulb is durable and ideal for night flying...easy to find and activate.
In general is a great gadget if you use a helmet. It includes a holder for the batts and wiring. There are several options combining NVG green along with red and white bulbs.
cheers