This isn't always true, but a fair amount of the of time if your electrical system spikes to where it's blowing bulbs like that, you may have something going on with your rectifier or a short. You may want to check your electrical system with a multimeter. With your key turned off, your battery should have between 12.5-12.8 at the terminals. Next, turn on the lights, you should only have about .5 volt drop. After you test that, start the bike and see how many volts you have at the terminal, it should read between 13-14.5 volts. Anything more than that would indicate your rectifier isn't functioning properly and can cause damage to your electrical system.
There's a good chance you don't have any problems, but you should check just to make sure.
Scottie