If you mean the "Dwarven Miniature Sun, Portable" its also sadly 200 crown gems and/or crate drop i think.

I much prefer "Beacon of Tower Zero" a free antiquity you can farm multiple of, or the "Varla Stone, Glowing" or "Culanda Stone, Glowing" both from luxury vendor or now guild stores for fairly cheap.

Depending on the color you prefer, i find these three are great for lighting pretty good size areas even if buried into walls/ceiling/items and you can get multiple for low effort/cost compared to some other lights.

But the Dwarven Sun is cool.

Personally my favorite are the clockwork illuminator, solitary capsules. You can hide them in ceilings and you'd neve know they were there, yet they light up the house and still let you use ambient lighting like candles. The light is close to white.

Before & after (note, all capsules are hidden above the ceiling. So you can't even see them, and they shine through the ceiling itself non-obviously.)