Just one additional note:

If you use the luminosity slider, you can only go as far as 100%. But if you type the value directly in the little numeric box, you can input whatever value you want, way bigger than 100%. This could be important if you have fog and/or haze in the atmosphere and/or if the sky is very bright but you still want stars to show up. In these cases, you may need to raise the luminous effect a lot. In my image I mentioned earlier, I have about 5000%.

By the way, this procedure (change the value directly above the slider maximum) can be used in all sliders in Vue.