Is Sickening Radiance really this big?

[Eddiesuxnutz]

https://i.vgy.me/DhrXiy.png

Here's a screenshot of how the spell was represented.

I feel like every map I run will have to be some massive mega city to avoid having this cover the entirety of all the maps lol

[Zacchaeus]

No, it's half that size. It's radius is 30 feet not sixty.