So I tested the colors I've been using to try to capture the effects of bright sunlight to see how they'd convert to a grayscale. I painted a few squares using hansa yellow, cad yellow light (hue), and white with yellow ochre. And cad red light hue just to show how dark it is in value, no matter how bright the color appears. When those are changed to grays in Photoshop, you can see how they compare to the lightest value of white (the background). The yellow ochre with white actually gives me the lightest value. Anyway ... I thought this was interesting to see that even if a color is very bright, its value maybe is not so light.