Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <PeterCGMN-at-aol-dot-com> While watching an overhead fluorescent light today, I noticed it was pulsing very quickly. How fast I'm not 100% sure but it was at least several dozen times per second, but can anyone explain y it did this? Thanks. 73, Kc0Ion,"Ion-boy"