You might want to look into AC Dimmer products. I don't have a specific manufacturer / product to recommend, but I think you can find generic boards that'll do what you want. I _don't_ know if you can find one in a nice enclosure.
From what I remember, you probably want something that'll provide zero crossing detection. My vague understanding is you get the equivalent of PWM control, by cutting the AC sine wave relative to when it crosses zero voltage.
From what I remember, you probably want something that'll provide zero crossing detection. My vague understanding is you get the equivalent of PWM control, by cutting the AC sine wave relative to when it crosses zero voltage.