nothing exotic and probably overlooked better choices

Maglight 2D LED...SolarForce L2M with 320 lumen module...my go to utility/nightstand flashlights

SureFire.... 6P with 240 lumen Malkoff module, G2 with 320 lumen Solar Force module, Scout Light on the 870 for gun lights

Fenix E01 lithium... keychain ..... Streamlight ProTac 1L... EDC

Fenix E21, and Black Diamond Orion headlamp... attempt at standardization to AAs (Sanyo Eneloops)

the cr123 powered lights are specialty lights and not routinely used