Can marijuana be grown as effectively under LED lighting and proper climate control rather than energy-sucking heat lamps? Heavens, it’s a big week for pot questions. Why just the other day I answered a query about whether it’s safe to use plastic soil beads in potted plants, and now this. Thanks for keeping the theme alive. Marijuana aficionados stereotypically feel a deep and abiding connection with the natural world, or so I hear. So stereotypically, I’d expect it would harsh their mell to know what a whopping energy footprint their buds have. Pot may look like an oh-so-natural herb, but until recently the illegal nature of it has meant not much grew outdoors, kissed by sunlight and light breezes. Instead, as you note, most crops have been raised indoors, under enormously energy-intensive and inefficient lamps. The good news is there are indeed ways the indoor-weed industry can clean up its act, and LED bulbs are a big part of that. But before we get to the solution, a look at the problem. Typically, growing operations use glaringly bright high-pressure sodium, or HPS, lights (metal halide and fluorescents are sometimes involved, too). How bright are we talking? Try 1,000 wat...