I almost sent it back. The box sat in my hallway for three days — enormous, heavy, and radiating the kind of buyer’s remorse that creeps in when you’ve spent the equivalent of a car payment on what is essentially a very large, very bright nightlight. My partner gave me that look. You know the one. The “what has wellness Instagram done to you now” look. But I’d been reading studies on photobiomodulation for nearly a year, and after my track coach mentioned that two of her Olympic-bound athletes were using full-body red light panels daily, I decided it was…