Maglight/streamlight big 5 D-cell size is a great light (I have one) has multiple uses in law enforcement (I will not describe) but as I said the 10 buck at Loves' with a rechargable battery works great.. Or you can use it with AAAs
1 amp draw at 3 volts they put out around 1,000 Lumens COB LED's very high brightness and you can focus (like the Mag).. multiple modes Some have low/med/high or low/high plus strobe and SOS modes (my Tac light has all of those low/med/high/strobe/sos/off) it was more expensive though.
5 D Mag makes a good club :) (Never used as such)
Did loan it to a mechanic once.