I found a voronoi setup that looks kind of like stars. I want to increase the brigthness to make the stars look like they're glowing. If I raise the emission, it can add too much blinding light to the scene however. Is there another way I can increase the brightness of the white stars while keeping the blue the same and also without adding light pollution to the rest of the scene? Below are my images and node setup.
If you want to brighten just the "stars", use a second ColorRamp to isolate just the white values (against a black background). Then, use a math node to multiply this by some value (depending on your desired brightness - higher is brighter) before adding it back to the original (colored) texture.