Filtered sunlight

“I made a nice job of it, didn’t I?” Mr Tiny said, nodding at the roof.
“You’d never believe how difficult it was to fit those crystals.” Larten
frowned. “You created this?”

“Just the roof,” Mr Tiny said modestly. “Perta and his cronies did the
rest. I added the crystals to cast more of a shine on things. You don’t have to
worry,” he added. “The crystals filter the rays of the sun. This light can’t do
you any harm.”

Larten hadn’t been thinking about the beams, but now that his attention
was drawn to it, he realised he felt none of the pain that he did in normal
sunlight.

***

The Saga of Larten Crepsley: Palace of the Damned, Chapter 3