bofadeez

I just noticed this today. The lights in my level 3 SPH are flashing in a very regular pattern: 2 quick flashes every five seconds. Has it always been doing this and I just noticed it? It's bugging the heck out of me and I've never seen it in almost 300 hours. It's just the three near the ceiling on either wall that are doing it. Anyone know what I'm talking about and how to make it go away?