No not seperating them. I asked this a while back and got a many people telling me to cut back the lights for a seasonal change. The idea is (and someone correct me if I have the amount of hours wrong) that during summer the days are much longer and hotter, and in the winter the days shorten and are a little cooler. For breeding season lights can be on as long as 14 hours a day. After 6-8 months you can start cutting the lights back 15-30 minutes a week until you reach 10 hour days. Apparently from what I was told that a lot of Phelsuma will respect this change in "season" and stop breeding.
On the other note, many people recommend that if you have a pair of Phelsuma that get along you should not seperate them. When you go to re-introduce them you run a huge risk of fights, just like they had never met before.
I think (like I said, please correct me if I got the time wrong) 2 months was about how long the lights should be turned back to 10 hour days. And after that you slowly increase them back to 14 hour days and the breeding will continue. This gives the female a much needed break and can increase egg production and life span. I noticed that my females were much more thin after breeding for a few months. That is what made me ask the question!