I read in
www.myphal.com that they were from "flasks" and my only thought on this is that its possibly going through a transition and/or a dormat stage. I would try the change of light and see what happens. I do not know much about flasks but my thinking and hopefully someone will correct me if I am wrong, that the reflection off a flask (glass) would make the enviroment brighter. Make the change, in a few weeks you should be able to tell if anything is going on and or it likes its new lighting.