My testing has shown that there is a difference between multiple 1 second exposures and a single continuous exposure of the same total time (presuambly due to the incandescent lamp's response to switching on and off, slowly ramping up and fading off). The difference isn't huge but it's significant enough to matter to me in many cases. As a consequence, when I do test strips in multiple 1-second exposure overlays I tend to do my real exposure the same way (multiples of 1 second exposures) to compensate. With continuous exposures, as you'd expect, my times are somewhat shorter. Is there a good rule of thumb for reducing your exposure to compensate for this effect? I'd imagine it depends on your specific enlager or bulb, but maybe there's a correction that is good enough for most cases? What do you do about this?