I just purchased two small portable flash units; a JTL mobilight-300 and a Elinchrome D-light 2. The JTL is advertised at 300WS the Elinchrome at 200WS. Using these lights, they seem to have much less output than advertised. To verify their output, I tested them against a Photogenic 2500, a 1250, and a Norman 400. These three lights were all within 2/10ths of a stop at 50, 100, 200, 300, and 400WS. Comparing the JTL and Elinchrome against these, the JTL tested at 104WS max output and the Elinchrome tested at at 51WS max output. Test was done with a Sekonic L-508 meter, at 10 feet, bare bulb in studio conditions. I realize that manufacturers are generous in their advertising. Has anyone had any experience with these? Is there a better way of determining the WS of a strobe?