vray-light tests and a question

[giraffe]

I have made some test renders with v-ray light on window openings for an interior. there are two vray lights on each window: one lightyellow and the other light blue.
and I got totally different results when I place yellow ones towards interior or the blue ones.
here is the top view:


when yellow lights are nearer inside and blue ones outside:


when blue lights are nearer inside and yellow ones outside:


when both lights are at the same position aligned together:


all images are rendered at the low preset for GI and with no color mapping.
can anyone explain me why I get different results when I place lights slightly in front of each other?

[dusan]

Seems to me that you havent unchecked the "invisible" flag in the vray lights rollout. Your vray lights act as solid planes and they're blocking eachother.

[giraffe]

thanks dusan