Having recently spent many snowy evenings watching the sun sink fast, I've noticed the light conditions do resemble those of the otherwise awful DVD version of the Hoth scenes.

While I'm loving the the fresh tint free snows of ESB:R another editor might like to employ intelligent blue shifting to the tint free evening shots (maybe making the blue shift more notable as the evening came on) for the scenes after the ice-cave.

It shouldn't be just a blanket tint though as I'm sure area illuminated by Luke's light saber would appear brighter and maybe a different hue of blue than the general location.

It would also make the bright white snow of the morning after really stand out.