The runtime test for both the Gerber and the MTE light are done. See the link above for more info.

Verdict: the Gerber lasted 14 to 21 hours and dimmed significantly before it died. The MTE lasted 23 to 27.5 hours, stayed at peak brightness the whole time due to it's electronic regulation, and is MUCH brighter on high.

They both go for $20-$25 delivered. Your choice.