On Monday, I received a new light to use on my helmet, a magicshine 808e. It's rated by the company as 1000 lumens, but the reviews on mtbr say it's closer to 700. Comparing the new light to my minewt 300, well, there is no comparison. The beam is stronger, tighter, and seems to last longer. I charged all 3 of the lights overnight and left them on high while at work, 6 hours later the 808e had turned itself down to the lowest of the 3 settings but was still running strong. I did notice that the casing was hot. After a little search on google, the light relies on air cooling, which will wont be an issue under normal conditions.
Vid clip of my buddy Christian crossing a bridge at Ipswitch on our most recent night ride.