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curious how they measure light output - for most lights, they use an integrating sphere, so you catch all of the light coming off the bulb - in the case of an HID or halogen, the light comes off in all directions - for an LED, though, it is much more directional so it's not really an apples to apples comparison (a lower number for LED could translate into the equivalent of a much higher number for an HID or halogen)
Also - the high power LEDs do get pretty warm (if you look at their website, you can see the cooling fans on the base of the heat sinks) - for many bike lights, they tell you to turn them off if you are sitting still for more than 5-10 minutes so that you don't damage them, so I don't know that the concern for ice formation would be as big a deal as it could be...
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