Lamp parented to plane with duplifaces renders lamp twice

[JuhaW]

This is same double render problem which was with group instancies.
Parent lamp object to mesh object which has 1 face and you will see 2 lights when render.
.blend file

[bdancer]

New build uploaded pls check if it works for you.

[JuhaW]

Works great ! Thank you, now Vray 3 is almost ready for interior renderings