I have seen this phenomenon once myself but had put it down to a once-off situation but now i have a customer who is experiencing the problem. I searched the forum and could find anything helpful, I was hoping someone here can shed some light on this problem. Pasted from user email: "...the lights in the kids bedrooms and in our dining room regularly flash very brightly and quickly when they are dimmed..." Its really just a short, bright burst of light, just a fraction of a second or so long, that may happen when the load is load is at a higher dimming level, but is only obvious when heavily dimmed. One load consists of 2x LV halogen downlights connected to an L5508D1A, and the other is a feature light (600W of incandescent lamps) connected to an L5104D5 pro dimmer and the installation is at the Gold Coast if that is of any relevance. Cheers Marc.