As for boosting your own happiness with a light visor, it probably wouldn’t be very effective. For one thing, too much light is not good–we require periods of light and dark to set our internal clock, and disrupting this pattern would likely have negative effects. But if you live in a place where sunlight is inadequate, and you notice that you feel a little sluggish or down on cloudy days, it’s *possible* that more broad-spectrum light exposure would help.