Rectange Lights: Problem with alphas

[simmsimaging]

I'm trying to use one image as a texture map on a Vray rectangle light, and use different texgtures for the alpha. I cannot seem to get anything to work properly in that slot though. Is it only possible to use the alpha channel from the same map in the texture slot, or am I missing something obvious?

Thanks in advance
b

[vlado]

Do you have the "alpha is luminance" option for the alpha texture? What does your shading network look like?

Best regards,
Vlado

[Morbid Angel]

This works fine, how did you connect your alpha image?