Hello everyone. I have an old 5 D cell maglite that I would like to put an in-expensive, good value LED drop in module in it. The light will not be for EDC use, but rather be there when and it you need it for a power outage and for emergency use. I want a brighter light than stock but do not need a 1000 lumen monster either. The light is going to sit until needed so I can not see paying $75 for a drop-in. What size firts the light and what have you tried?