Not dumb. I forgot you're using Insteon. (You know that Lutron has RF dimmers too?)"Not supported"?? What does Insteon support? Line level passive only?Drop USA Light a email with the triac question. I'll be shocked if the answer is, "No". (Afaik, Lutron GE uses those types of dimmers and there's never been a question about MLV on them.) The fixtures we've been talking about each has an integral transformer. Some more expensive ($$$) lines use separate transformers.