The crocea's and the bigger squamosa I had for the longest, about a year and a half. The maxima's and the small squamosa I had for a couple of months. They have all attached to a half clam shell so I can move them anytime, but they haven't moved around at all so they seem happy where they are. They are under 250 watt 10K metal halide XM bulbs and vho actinics.