You should put a reflector over those bulbs so you they throw the light down. It can be hard to get a reflector that does the job, but this is my set up:
As you may or may not be able to see, there is a red wire that runs down the center of my reflector. That wire supports my lights and holds them up. How that happens is that I thread the wire through the more rectangular opening below the spiral. It hangs the CFL bulb very nicely and it is impossible (unless the glass snaps in half) for your light to fall. Using insulated, copper, wire ensures that it will never break or fray. You can also find wire that is rated for much higher temperatures than the surface of a CFL bulb so you do not have to worry about a potential fire hazard.
My reflector is just a simple aluminum wing-style reflector that I got when I bought my 400 hps. It just so happens that this reflector fits perfectly in my current grow cabinet. Anyway, this reflector has two holes on each side that are like a colon ( : ). In these holes I have tightened a zip tie to act like sort of like a tie down point.
That tie down point does two things: it allows me to attach the hook for my ratchet pulleys; and it gives me something to wrap the supportive wire around so I can zip tie it to itself after I wrap it a few times.
I can't really recommend a certain type of reflector or anything if you decide to do this, but I recommend the method of reflection whole heartedly.