Well, techinicall it's a thin space but you get the idea. There is a closet that has about one square meters total, but it's 2 ft by 6 ft, height is no issue as it's 9 ft tall. What if a person was going to use this space for a SOG setup and wants the reliable HPS lighting? Should there be a single 400 or 600 watt or a pair of 250's? The closet could probably handle about 15 SOG plants and the pair of 250's should provide good coverage without crowding. Does this sound better than a single light? Also, would there be advantage in using red panels of LED's as supplemental lighting or is that unnecessary? I guess what I'm asking is, is there a ceiling limit to light that no longer brings benefit?