[Rifleman1776]

One feature of the Ruger Redhawk I love is the interchangability for front sights.
But, for more versatility, I have painted the black sight using flourscent paints from the model shops. (cars, airplanes, etc.) Small bottles are not expensive, effective and last.
But, in low light, the nylon in yellow on the R'hawk works very well for me. I like it.
Some will argue, but a very good second choice is black. In low light it will still contrast with backgrounds and animals like deer.

Edit: I partially agree with Drail. I paint only the rear of the sight with flourscent paints. But, the all yellow nylon sight from Ruger doesn flare and is fine in bright sunlight.