Nice image - the lighting has a ghostly quality.

Yes this new feature it does open up many possibilities, and it might just be what I've been looking for to provide lighting for one of my long-standing ideas.

However, it doesn't work properly with Area lights yet - the clouds don't pick up the colour of the area light.

Yes, the light power does need to be cranked up quite a bit beyond usual levels to shine through the spectral particles.