How can I make lights go through transparent material ?

I'm modelling a scene which has a glass window that a Spotlight goes through. But no matter how much I adjust its transparency (Raytrace material), the light is still prevented. It's just available when there's nothing standing on its way. Btw, I really need the glass window. What can I do to make the light go through the window ?

Thanks in advance.

If using Studio Max and the library raytrace glass, make sure that the spotlight going through the window has its shadow type set to 'Ray Traced Shadows' as other shadow types will not allow light to pass through glass.

If this fails to work, ensure that the light is not disabled and that the objects in the room are set to recieve light from that specific source

also you can use some volume light effect from enviroment to cheer up your scene more

Yeah, i absolutely agree with you :) :)

maybe exclude the window from receiving lights and shadow in the lights "general parametre" option.

ok if u r doing in max use plan instead of box coz plan has only one face so if u use light on the back side u'll got the effect of reflracting og light