> What would be the longest possible time it would take to turn on an > incandecsent 150 watt bulb with a triac controlling 110 volt 60Hz > current. Somehow I figured it could be as long as .040 secs. This is > assumming a perfect light bulb, that would illuminate instantly and a > perfect triac, that would turn on instantly. It should take nowhere near that long. Even one complete power line cycle is only 17mS. How did you come up with the 40mS figure? ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.