There are three I won't part with
1) incan E, in every configuration I can get my hands on. When I came in here in 2014, it was the very first recommendation I was given. I was raised in natural light, and though LED is efficient and their light quality has gotten very close, to this day no single LED can match the superior tint and color rendition of incandescing filament. Incan is supported well now because batteries have gotten so good, but incan Surefire & compatible have also gotten unaffordably expensive for mere flashlighting, but incan MagLite lumen junkies know.
2) Noctigon KR4 w/ E21A emitters - there are things I don't like about this light, such the pointless extra colored emitters that barely provide any light, that it is a hefty light and could have been trimmer, and that there really is no single emitter version with reflector (there is and there isn't, the KR1 driver is missing one key feature), but what is great about this light is that when ordered with Nichia E21A emitters, the FET driver is Constant Current, and of course, light output is regulated. The 3500K E21A emitter is the closest I have seen to actual incan, the 2000K E21A emitter is the closest I have seen to the last few minutes of a saturated Golden Hour sunset.
3) Zebralight SC5c MkII 4000K, because satisfactory color rendition, amazingly bright for AA, and amazingly efficient with sublumen modes. Tint is a little wonky, but tint doesn't affect its utility. Also, it is regulated, it is small, and it tailstands like a champion.