I just got done doing a test with my Keygos 6X CREE XR-E Q5 LED 1600 Lumens flashlight. Now before I continue and get ripped about this light not being a 1600 lumen legit light, I will say now that is what the manufacture rated it at and not me. I just know it's brighter than heck. One of the brightest lights I have right now. Here's a link to what it looks like.
I have the extra tube extension added and ran 3 of the 18650 Trustfire flames for right at 1 hr and 15 min on high and it was still going very strong when I shut it down because the head was getting really hot. But I have no doubt it could have went a lot longer. But these Trustfire Flames are very good batteries. That impressed me compared to the old red cheap Ultrafire batteries I used to run in it. So I thought I would share my thoughts with you guys and complement this brand of battery.