Saw this light at ****s Sporting goods this morning. Is this the same as a David 15? Package said 1.38 watt, 10 hr runtime, 1 AA. I have a Dorcy 123 and was looking into getting a 1 AA. How would this light compare to the Fenix, Lite-flux and others? 10 hours seems like an overestimate for a single AA. Are any of these 1 AA models brighter than my Dorcy 123 ?