So, what are you saying? Your light is a pendulum that swings every two seconds? Kool! How about some pictures? How long have you been using it? Had any results yet? How big of an arc does the light actually make?
It seems that the "Moving Light" would creat it's own air movement and, along with, the thermal raise of the air, you should have excellent, passive, ventilation - given adequate ports.
I've been looking for any, and all, info on "Cycles Per Minute", as it applies to "DIY Light Mover Projects". So I find this quite interesting!