Each day I think I know less than the day before. Profoto says its new B1 (500ws) provide 10 times more light than a camera flash. I have made this measurements: At 2 meters, a profoto D1 500 (500ws) provide 700 lxs (lux second). So the BCPS is 700 x 4 = 2800 js (jules second)... but my metz 45 claim to have a BCPS 4.500 js... I measure a Bowens gemini 500 at 2 meters with the normal reflector (S) and have 1100 lxs, so it is a BCPS 4400 js. ¿What is the ws in a camera flash? ¿What is the photometric render in a camera flash? ¿35lm/w? ¿11lm/w? The broncolor data in their catalogues seems to be around 40lm/w. ¿Can a camera flash (a nikon SB900 for example) equal the light power of a 500ws studio strobe?