> The couple I have pulled apart seem to be a simple > rectifier to a filter cap, then use a high freq > inverter to drive the tube. > They should work fine off a relay, triac or even > a series diode, but dimming using a triac and > phase angle switching would not be nice. > -Roman I wondered about the dimmer "don't do" on the packet. You'll notice it's in a triangle and a different shading to give it special prominence. Pity though with all the empty space around those warnings they didn't take a minute to elucidate -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.