I have been using the elinchrom quadra with an extra small chimera softbox. I jst shot a quick test with the elinachrom quadra portalite made for the quadra . It gave me a about 3/4 of a stop more light and was just a touch harder does this make sense. The portalite is much more shallow and the difference is so slight in terms of quality the porta is defitnily a bit harsher. But is smaller and easier to deal with it is about 4 inches less wide and the same height.