Aviation "torches"
Best overall (price no object): Surefire "Kroma." three color LED's (white, red, blue), mil spec construction, lithium batteries with 10 year shelf life. Beautifully made - a serious "instrument." About $300 U.S.
Best value (price considered): Streamlight Twin Task combination LED & Krypton incandescent. About $35 U.S. via discount Web dealers. There are a number of other Streamlight models well suited for aviation use, and all well priced.