I'm about to shoot a short fantasy film and one secne takes place inside a sewer tunnel, the tunnel will have daylight coming in from small windows between the left wall and the ceiling, on the right wall there will be a long line of dimmed practical lights (100W bulbs), on the floor there will be a water tunnel on one side and sidewalk on the other - i've attached a drowing of the set.
I would like to key the actors with light that is bounced from the water on the actors faces creating an effect of moving lights on them.
what's the best way to do it? i can't put mirrors under the water because it's to expansive and a few kids actors need to step on it, i thought about using an aluminum wrap, but will it bounce enough light?
and how can i keep this scne low lighted and contrasted?
i'll be using an old sony betacam 400 (low budget production) and for lights coming from the outside i will enough baby 1Ks, i hope it will do...