I have several Elation Platinum 15R Pro fixtures in my theatre. My current issue is one of lamp striking. I can see that the lamp is trying to arc, with a blue light coming from the lamp and an arcing sound, but it just won't complete the job. It keeps trying every 15 seconds to no avail. I'm not sure if it is the lamp, the power supply or the ballast. Anyone able to point me in the right direction?