Can this actually do a sustained 800lm for 6 hours per the manufacturer spec?
I don't think so. If you ignore the stepdowns in my runtime measurement and assume that it can maintain high level all the time, I'd say the total runtime at 800 lm will be more like 3 hours. Which is more or less what you get from the flood channel after the initial stepdown. Turn it on at turbo, wait 30 seconds for the stepdown and then you'll get almost 3 hours at roughly 750 lm.
If you want to go professional, there isn't much choice. Either The Sofirn/BLF LT1 or the smaller Sofirn LT1S Pro. Both have the Anduril operating system with a very complex, but also very powerful UI, they have adjustable color temperature and brightness – both either stepped or smooth – and the LT1S Pro even has a red channel!