That's essentially what I'm doing Don, except I don't have a meter sensitive enough to make a measurement with. What I'm doing is similar to making star trails except its indoors with a still subject. My hope is to expose long enough so that enough light registars on the film to make a normal image. The advantage is there's no directional light on the subject. So its illumination should be very even.
A long time ago, back in the juvenile years, we shot a landscape like this with kodachrome. Just opened the lens for 30 minutes and it worked. Got the real colors of the vegetation without any sunlight on it.
Maybe I should just go and start with a 20 minute exposure and see what happens. If I'm half-way successful, I'll post in in the Gallery.
Cheers to All,