What do people think about the effects of such bright light on skin? I have heard anecdotally that some SAD lights can cause sunburn. The long term oxidative effects may not be desirable, either aesthetically in terms of skin ageing, or for health in terms of skin cancer risk. The health effects of stress/loneliness/depression and sheer subjective misery are powerful counter-arguments regardless. I'm currently in the middle of building a light setup based on this one by David Chapman of Meaningness.