Thought this might be of interest to some... there have been a lot of posts about lighting BIG spaces, but I don't recall anyone actually showing their setup (Thanks to Derrel for the consult on this!). I was asked to shoot a Cadet parade in a local Armoury; the interior space was about 220'x80' with a ceiling about 40' high at the peak. My lights were 5 Speedotron Brownline M11 heads running off of 1600w/s power packs so that each light was pumping out 800 w/s. The lights were clamped to balcony supports about 18' above the floor and aimed up to bounce (more or less) off the ceiling: The lights were held in place with magic clamps, and the cord was passed twice through a turn-buckle as a safety measure in case the clamp let go; had the turn-buckle not been there I would have added para-cord safety lines. This balcony area was open to the public, and while it wasn't expected to be used much, if at all, I didn't want to take any chances. Here you can see my cables ball-bungeed to the railing, the power cord is gaf-taped down, and the power supply has a safety cord (it's too tall to fit under the railing): Ball bungees keeping the extension cord secure and out of the way: As an added precaution, the handles on the magic clamps were also gaf-taped to prevent idle twiddling: Here's a partial view of the space; you can see the hot spot from the light, but as I wasn't shooting on the balcony, I wasn't concerned; the idea was to get an even, flat light on the floor to produce the best overall photos: The goal was to get sufficient light to allow me to shoot sync speed (1/250) at f5.6 <ISO 800. The general results looked something like this: Not bad for a space lit with metal-halide arc lights and a few gable windows. Base exposure without flash was ISO 1600, 1/25, f2.8.