I want to do some informal portraits with my recently acquired Bronica GS-1. Nothing fancy, just taking some nice photos in a living room. I don't have a flash yet for this camera, and I think a flash may be too distracting when photographing my best friend's 9-month-old nephew; it will be difficult enough to get him to pose.

Somewhere around the house we have an old floodlight my father used for Super 8 movies. It is similar to this Sylvania Sun Gun:
http://static.flickr.com/40/121134224_09f0192809_b.jpg

Having had to hold it as a child, yes, I know how dangerous it can be.

Bounced off the ceiling, would that old movie light be okay in lieu of a flash or studio lighting? I'm planning on Portra 160, and maybe some B&W.

This is just for family photos, mostly for fun. Nothing critical or frequent enough to invest in real studio lights.