gchart
(gchart)
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I agree with Parametrek… something seems fishy with those numbers. The Cree XR-E specs state a Max Efficacy of 99 lm/w. So to run at 300 lm, you’d need to be pushing at least 3 watts (probably more like 4). Discharging at 3 watts for 2 hours, that’s an overall power requirement of 6 watt-hours. A Eneloop Pro AAA runs around 1.2V and 950 mah… so just over 1 watt-hour. So in order for this to happen, the 300 (?) lumens would have to be a short burst, followed by a big step-down.