This was very helpful! I always thought my Magicshine was 1000 lumens. Dammit!
When the magicshines came out, they were much brighter than any light that my local riders were using. They work great, but they are cheaply constructed--but rarely seem to break.
My Dinotte is definitely brighter. (for now--there's a lot of bright, cheap Chinese led lights out there)

Where did you get the Dinotte XML-3 at?
direct from dinottelighting.com

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Older lights, probably most of the non-LED lights, would dim as the voltage dropped while the battery discharged.

"Most" newer LED lights have a voltage regulator built in, so the light stays the same brightness until the voltage drops below a minimum. My Dinotte stays bright, then flashes 5 times to warn me, then switches to medium, then to low automatically. And the blue indicator light blinks.

Most LED taillights will fade as the voltage drops.

It's not a good idea to completely discharge the lithium batteries--it shortens their life.