Load a Poser prop like a one sided square (any thing will do). Position it where you want the center of rotation to be. Parent the lights to it, then make the prop invisible (Object> Properties> untick the Visible box). Select the prop from the dropdown menu and rotate it, the lights will follow. If the lights are infinite, you will have to change them to spotlights before you can parent them, after parenting they can be changed back to infinite.