FWIW, the Fenix P1D lights are very small and can be very bright. More importantly in this context, they have a strobe (and SOS).

I have one of these "premium Q5s" on my keychain.

Yah, they are expensive, but so small and versatile and there is no excuse not to have it with you.

FWIW, my primary EDC is an HDS EDC U85, which also has a strobe (HDS EDC is out of production, it will be replaced by the Ra Clicky in Aug.).

Both of these lights are at least as bright as the benchmark Surefires (E2e, 6P).

These LED based lights with strobe are very bright, efficient, small and reliable.

-john