Thanks for the reply. I have a Soundlab DMx Controller with 36 Channels controlling three Geni colour changers. These genis use gobos to change the colours not seperate lamps. I have set up various scenes into programs and when the program runs through the scenes everything is good. The lights change to the colours I have set up. The problem comes when I go from one program to another. The Genis flash white three or four times and then continue through the scenes and again everything is ok. So in short - everything is ok until i change between programs and then everything comes good again until i change programs again.