Film projection

Hello all,

 I'm looking at ways of using Luxology to create reasonably accurate film or cinema type image projections to study cinema wall and floor finishes.  I'm using spot lights and transparent image slides, but it does not seem possible to create in-focus projections at realistic distances.  I need to be able to calibrate light output in lumens or similar to check that my estimates are reasonable.

Alternatively, can anyone give suggestions on using glow materials or area lights to simulate rear-projection screens?  Again, I would need some way of calibrating the simulated brightness.

If anyone has tried this before, or has any advice, please let me know.