With the mods I have installed, Morrowind becomes a very dark game but if I raise the gamma anymore than I already have it becomes way to bright, this problem can luckily be solved by using Night-Eye spell.
However it only lasts 30 sek so I need to recast it over and over, and for some reason I can't find it as a spell effect when I try to make my own, longer lasting spell, with spellcrafting.
Is there something I'm missing in the spellcrafting menu? Or can you make your own Night-Eye spell in the game?
If not, is there a mod that adds a longer Night-Eye spell?

Night Eye can be used in spellcrafting and enchanting by default.

if it's not there for you and you have a spell/power with the effect, it seems likely that one of your mods is messing with the ability to make spells with the effect.

https://imgur.com/a/ChVf7CE

Ok, it must the Spell Organizer Mod I'm using. Gonna try turning it off and see if that helps.

Edit: Waaait, just figured it out. I'm playing a Kajit character and are using the "Eye of Night" spell, which is a race ability and not a real spell. So I don't own a Night-Eye spell... -.-