I go to the best school in the world retard. I think I would know. Also, it really depends on the light source. I was thinking of a lightbulb,
e.g The more power gets thrusted into the light, the more energy there is. So yes, there is an energy increase retard. Also, even if the light would not create energy, the heat would, thus either melting or reshaping the glass. However, due to the refraction of the mirrors, it would most likely come to one or more points, in a concentrated focus.