From what I've read on the forums, the globrites can only be replaced with globrites when needed so you may want to consider something else that don't have that limitation (microbrites?).
Kathy brings up a good point. Globrites have a special niche which requires the same light when one goes out. Microbrites use a standard 1.5" opening, which could fit just about all the other lights out there, or any newer light Pentair comes out with. Most builders who install Pentair equipment usually will go with Globrites or Microbrites these days (Pentair brands), but if you read a lot of the issues here, neither have a great track record of making it to their warranty date. When you need to replace a light, replacing a Microbrite with whatever, is going to be a lot easier than if you have a Globrite in there.
Swapping the Globrites for Microbrites would give you a good light now, and good flexibility in the future.
You can check out my build for some pictures of Microbrites installed, and here is some other good information on the lights....