Light Brushes for PS7?

I've got a bunch of really cool light brushes, as well as some smoke/cloud brushes.

The problem is, whenever I use them, I can't seem to figure out how to actually make them have the same effect as a light texture would. Are there are specific colors or settings that would make the brushes look like lights, or are they not intended to be used as a light texture would?

Any suggestions would be appreciated.