A guy named Wayne Johnson puts these LED lights together, and I have been very satisfied with the one I have, a XM-3.
It is truly built like a tank. It's heavy, a bit large (compared to Surefires) but it has earned my absolute confidence and sits by my nightstand. The reasons I like his lights are:
-Common batteries (the XM-3 uses 2 AAs).
-A cold white light (about the same intensity and brightness as a 6P/G27/Z2 series).
I have just ordered a "Little Friend" from him, and I expect it to be similar in quality.
Check these out at:
http://elektrolumens.com/

It is truly built like a tank. It's heavy, a bit large (compared to Surefires) but it has earned my absolute confidence and sits by my nightstand. The reasons I like his lights are:
-Common batteries (the XM-3 uses 2 AAs).
-A cold white light (about the same intensity and brightness as a 6P/G27/Z2 series).
I have just ordered a "Little Friend" from him, and I expect it to be similar in quality.

Check these out at:
http://elektrolumens.com/