Upwards of $100 — because I count “most used” time accumulated starting back when dinosaurs roamed.
That would be an Arc LS with tubes to use CR2, RCR123, or 2xAA, and modified with an amber Luxeon and a custom driver
EDIT — the driver is Goldserve’s FLUpic. Many, many options. Mentioned at Found a Tri-Flupic Driver in my drawer, what to do with it?