Have looked at MR, and run some tests. The abilty to measure luminance/illuminance and to walk through a lit project are two essentials which i can only do with a radiosity solution. I understand theat MR does support IES photometrics, which I use exclusively. There's not much support out there for a professional lighting designer, in fact most people recommend using dedicated lighting programs. I don't buy that, and I've heard someone like Felix Breton present work that makes me think that I can achieve what I need with Max/Radiosity. I want the ability to present realistic, accurate images, showing my lighting design, not simplistic renderings, a kind of dumming down design. A large proportion of my work is showing work in progress type of images, part of the dialogue I have with the architect. Not just a pretty picture at the end. A bit of a long reply! Thanks for having taken the time to reply to all the previous! Angela