Light and net curtains

Can anyone advise me on the best way to get the effect of light beaming through net curtains.

http://www.3dlinks.com/gallery\_fullview.cfm?id=15227

Above is a link to Roman Losevs work who is absolutely great at using vray. Inspirational.

Any tips to do with materials , lights and gi are more than welcome and apreciated

by the way i use max and am waiting for my vray advanced system to arrive

kind regards

Nebille