So what LED is the Cateye using that allows it to put out 800 lumens for 2 hours on a 3.2Ahr battery? I really am asking out of curiosity.

However, looking at the We Test Lights website, it looks to me like they kind of fudge the light output. The Chinese Cree you linked to gives has a consistent light (if too low) light output over the 4 h run time while the Cateye has a spike of 800 lumens that only lasts a few minutes and then seems to dim with time over the 2 hours of run time to a very dim 92 lumens. It's not fair to say that the light has an output of 800 lumens if that output is only a spike at the beginning.

And, from the standpoint of a commuter, this is kind of a dangerous trend. I tell people that want to ride at night that it is a little known fact that it gets dark when the sun goes down. It's a bit facetious but my point is that on the ride home, it gets darker. With these smaller units, the constant dimming of the light means that you are going to get less light just as you need more light. On the morning part of the commute, it doesn't really matter because it's getting lighter all the time but at night, you simply don't want your lights to fail.

Looking around at similar lights, this seems to be how these lights work. They are bright initially but quickly fade.

I do want to thank you for the link to the website. Although I think the test on the Bright Eyes is wrong, it is still a useful site.

Yes. You are correct. My error.