Creating lights... but no light emitting

I have a scene in which I’m adding lights… and they’re not emitting anything.

Never seen this happen before, so I’m not sure what to look for.

Any ideas?

[edit: plugin True Sky seems to have killed lighting. Looking into it.]

Sometimes, blender just makes you wanna make it higher to make the light emit.
If that doesn’t work, I don’t know much to say.