What I have found over the years...
On the cheap. 30 pulse years ago when I was a street cop working the 'graveyard shift' I would use the light blue 'White Out' on my sights. Cleans off with ease, re-coats with ease.
I have a revolver with 'McGivern Gold Bead' front sight. It is fast to find in low light. But, in bright light, the angle of the light will move the sighting view and point of impact toward the light source. The brighter lit front sight just pulls the alignment that way.
The 'tritium' and other naturally powered lit sights are not only expensive but some what touche (OK, the ones I had dealings with 15 to 20 years ago.)
The bright/glow-in-the-dark paints would, in my view, draw sight aliment off a little, be more or less permanent and a good option if you do a greater part of your shooting in very low light.
If you haven't done 'near totally dark' shooting, try it. I think you will be surprised how well you cans sight using the muzzle flash from your previous shot/s.
Hope your quest is productive.