I searched all over the internet for full spectrum bulbs that can be hung overhead to simulate real exposure to sunlight. This is an approach that has worked well for my wife and me as a supplement or an alternative to sitting in front of an intense "happy light" (which I dislike). These ALZO bulbs are the only thing available that have a full 1300 lumens with light quality of 5500K and CRI 93+. Watch out for suspiciously marketed bulbs that do not truly emit full spectrum light (they are too low K and CRI) and are too dim (low lumens) to do what they are advertised for. These ALZO bulbs are very bright (so you wouldn't do night reading with them) but they wonderfully simulate bright sunlight.