I did a run time test of the E12 at high mode and medium mode. In the high mode, they must really be pushing the current out of a single AA battery as it only lasted 62 minutes. I estimate the lumens to have averaged 150 over that time frame. It's apparent to me that an XP-E2 isn't meant to be driven like an XP-G2 or XM-L.
The medium and low mode is where the E12 really shines as far as efficiency goes. I measure efficiency as the area under the curve (length x width) or output x time. Note from the 2nd graph that it was the 2nd most efficient light at medium mode that I have tested. And that is but a third of all the 1AA lights I have tested. Its output was very steady right up to the battery's end............one of the best I have ever seen. By the way I was using freshly charged Eneloops for the test.
I have to say that I like this light. I would plan to use it mostly on the lower modes knowing that I'd have that high mode if needed but if trying to maximize battery life, the medium and I suspect low mode are very efficient. I haven't done a run time of the low mode and probably won't bother. I estimate medium mode to be 68 lumens and low mode to be 10 lumens.
High mode - highest efficiency in the order listed from top to bottom
Medium mode
The medium and low mode is where the E12 really shines as far as efficiency goes. I measure efficiency as the area under the curve (length x width) or output x time. Note from the 2nd graph that it was the 2nd most efficient light at medium mode that I have tested. And that is but a third of all the 1AA lights I have tested. Its output was very steady right up to the battery's end............one of the best I have ever seen. By the way I was using freshly charged Eneloops for the test.
I have to say that I like this light. I would plan to use it mostly on the lower modes knowing that I'd have that high mode if needed but if trying to maximize battery life, the medium and I suspect low mode are very efficient. I haven't done a run time of the low mode and probably won't bother. I estimate medium mode to be 68 lumens and low mode to be 10 lumens.
High mode - highest efficiency in the order listed from top to bottom
Medium mode
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