Just got it today, so I'll come back and update this more after I've had a bit more time to play around with it, but it's worth noting that the IR LEDs--which do generate quite a lot of heat--use a physical light sensor as their cutoff.
The sensitivity of this sensor is adjustable via a tiny (TINY) adjustable screw on each of the two LED circuit boards--tighter = less sensitive (turns off more easily), looser = more sensitive (stays on under brighter conditions). I think they ship almost fully loosened, which is why I'm seeing a lot of reviewers saying they're always on: I had the same issue initially.
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