I think we've come to the conclusion that the USB ports in the edge don't have a lot of power. I haven't been able to use my external USB hard drive unless it's plugged into the wall (ie can't run on USB power from the edge alone). So, what you say sounds exactly like that power issue. I can't even get my SD card reader to work in the USB ports (and I think that's also a power issue, because the card itself works just fine in the SD slot).
I haven't tried a USB light, so I can't give a recommendation of one that's low power enough to work with the edge. But, looking for a light that's either not USB powered at all, or requires only a tiny bit of power from the USB port is probably your best bet.
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