If you have access to Thaumic Tinkerer, and are willing to spend a little while doing the research, I would recommend the Gaseous illuminae to you. It's basically an invisible light source, which you release into the world via a right click. Each one lights up 16 or so blocks, but you can put blocks in the area without risk of the light going away. So yea, you can light up an entire base using a light that acts like it isn't even there! (Well, there are a few particles that come every once in a while, but that's about it.)