Six panels installed with an Allsmartlife 0-10v dimmer switch The micro screw for dimmer adjustment is very fragile and breaks easily. (The manufacturer sent a replacement switch). It also matters how you connect the 0-10V switch white and gray wires to the panels. There was no dimming on my first try; After tangling the wires, the dimmer worked. I had to contact the manufacturer to find out: What size electrical wire is suitable? The instructions contain a minimum of information. Responses were good, but expect a time lag; technical service in China, it seems. (Hello, Nelson.) Next on the list; proper disposal of a dozen 8ft fluorescent lights!