Aqua Subterranea [Commercial]

Merlin Studios

SpottedKitty said:

Yes, there are Iray lights — each of the lanterns has a sphere in it with the surface set with the Emissive parameter. It's all very dark, though, so a quality render might take some time. One solution would be to select all the spheres, turn up the Luminance dial, then adjust the Tone Mapping values until you get the precise level of spooky dimness you want.

You can also hide walls and ceilings not in view to let more natural light into the scene.