You can use the method I suggest and still map any texture you like. Look at my image
http://www.renderosity.com/mod/gallery/index.php?image_id=1639916

This is not a light ad panel but the principle is aproximately the same. I used the sun for this effect but you would use normal point lights.
The one thing that is essential to achieve this result is to increase the "transmited light" (to 100%) in the material properties (I can't open Vue right now so I can't tell you exactly the name of the tab and slider, but this is in the tab where you specify the amount of difuse and ambient light for the material).
If you don't increase the transmitted light, the light will not use the color information of the mapped picture.