I thought I had read somewhere how you can make a flouro fixture flicker on and off as if it has a bad bulb or ballast. I recall it being done with a dimmer. I tried this with a two tube 40w shop light and an SCR dimmer. I tried several fixtures, all had transformer type ballasts, some had starters, but had no success. The fixture would dim somewhat then go out as I chopped the voltage. The tubes would come back on near the the top of the dimmers range. I could never get the effect of a bad bulb or fixture randomly flashing on and off or never fully lighting. I need to do this for a location shoot in a basement. I don't think having someone switch it on and off would give the same effect, that would kind of be all or nothing. Brings some old tubes to a location and installing them is too unpredictable. Any ideas??