This is my left and top viewport as you can see i have made two big openings so a lot of light is able to come in the room. I have placed one plane vray light in every window, and a omni light with the far attenuation on make the attenuation big enough to fill the room as you can see on the image above, on the omni light i have set the multiplier to 0,5 and it has a light yellow color. Lets take a look at the settings and what they stand fore. Once you have install the vray plugin for 3ds max you will find the vray lights under create where all the other lights are. yWYsN
Here is an explanation for the parameters of the vray light