Hi, and welcome to the world group specifically made for glowans!

It's originally a Homestuck fanspecies created by Magdaneela and developed with Crimson-Catalyst, therefore it does have some of its roots in HS, but anyone can make one regardless of whether they've read Homestuck or not! Yep that's right, it's an open species.
You're still trusted with figuring out as much as you need to know about it, but don't worry, I'll provide you with links.

Without going too deeply into rambling about what they are, it's basically a colorful humanoid alien species with a caste system based off the number of pupils in their eyes. They also glow, hence the name. Avinara is the planet they reside upon.

There are a lot more details than that, so make sure to check out the links below!

Useful links: 
Giant infodump
- details and lore (a bit outdated alas)
Tumblr ask tag
- additional lore, basically
Towertrapped
- the HS fanventure
Database
- currently defunct
dA Group
- deviantART group page
Towertrapped discord
- small discord community for the comic
we have more resources there and a q&a channel