Hi guys, just putting down my realistic experience with UT800. I've had it for a while now and I usually go out for rides at around 5 in the mornings around areas that are lit by street lamps. Sun isn't out yet so no daylight.
The device itself is great and is controlled perfectly by my Edge 1030.
The box says 1.5 hours on high beam for UT800, but realistically
Low battery warning at 38 minutes
Light flickering (bright/low/bright/low) at about 60 minutes
Constant dim light with no modulation of light at about 62 minutes
Now, I don't know if this is right/wrong or the device is faulty but I"m putting it here so that anyone interested in buying this has some expectations around what you really get in the real world.
My ride usually lasts for about 90 - 100 minutes and I carry a separate power lamp for backup purposes.