Terralux Ministar5 Extreme for C and D Maglites
The Terralux Ministar5 is a dropin module for C and D cell Maglites, there are two versions: the TLE-6EX for 3 to 5 cell lights and the TEL-6EXB optimized for 2 or 3 cell lights.
The dropin changes the incandescent bulb in the Maglite to a SSC P4 LED, a very efficient and bright led capable of producig 140 lumen of output. Runtime is variable depending on the number and type of cells of the original light.
The module is regulated so the light output will be constant regardless of the state of the batteries, when the batteries are almost depleted output will decrease to offer some useful light for some hours, this avoids getting no output at all suddenly and is a good idea because carrying spare C or D batteries is heavy.
The beam is excelent and retains the original Maglite focusability, the throw is as good as in the incandescent beam or longer and the sidespill is useful. The overall brigtness of the dropin greatly exceeds the incandescent version so brightness, runtime and lifetime are improved at the same time making the upgrade an option to consider if you already have a C or D Maglite in your kit.
You can get it for $25 from Lighthound.