The Plight of the I-beam kitten robot

I was playing around with dupliframes and made an abstract sculpture, then worked on lighting it, because I need to work on my lighting, and then decided to give it a very modern-artsy name.

So here it is, it depicts the downfall of a robot kitten who could shoot I-beams (but not H-beams) from his mouth. It’s so sad, isn’t it?

Is there a way I could have light emit from the cracks between the dupilcated cubes? I think I could just use lamps, but that would greatly increase my rendering time.