Dear friend, our lamps are workable for most of the moving heads. But we found some customers complained when received our lamps, they were no light on at all. We tested all our lamps again and checked with experienced engineers, we found some countries use AC110V working voltage and the moving heads with Electronic ballast is not workable with our lamps, especial the Robe moving. So when you order our lamps, please make sure your movign heads are with inductor ballast. Thanks.