I don't have lights laying around collecting dust. Sure, I have about 16 lights but many are used for bicycle lighting. Have 7 bikes that use lighting so it sucks up the lights.
My everlasting joy lights or should I say "Once all your ordered lights, parts and components come in... you can never buy anymore flashlights" type lights are a few. If I went with only two, it would be the FF3 (can do keychain, pocket, bicycle helmet light, flasher, SOS, lanyard light, emergency light on low and pocket rocket) The second light would be my upcoming BAM four K2, 400+ lumen, multiple output, HA-III bored 8AA Mag for bicycle lighting, emergency lighting, big cannon when I need max photons type of light.
Very small 75 lumen and large 400 lumen light would fill all of my needs in a pinch. All my other lights fit niches but those two can do it all, at least for the non-flashaholic part of my brain.