Tystick I understand what your saying about light not being throwoutn perpendicular of the bulb, and do agree... I've tested the theory with a nice light meter..... Remembering that I'd say you're right pauli Id squeeze ten, and see what happens from there....
I just always start with low light because I always see so many throw as many hoods thatll fit in a room, say this room squeeze 15 in there, then pull 20 ps, but efficiently and done correctly, they could've done a 8k the right way, saved on power, and still pull 14-18 lbs with almost half the light
I dont know jack squat about lighting specs, but I know what I've tested and works.... I laugh at people telling me the 15k stories when I'm almost matching there lb output with 8