Quoted my message above for reference. If a light were shining in actually clear air with no particles in it then cool light will scatter more. But my guess is that there is usually a significant particle density in the air whether it be fog particles or dust. Even if it doesn’t look very hazy there are a lot of particles. Scattering off of these relatively large particles is probably going to be dominant, and this type of scattering is not wavelength dependent.
Below are some pictures I just took. On the left is a convoy S2+ with smooth reflector and 2mm^2 white flat. On the right is another S2+ with smooth reflector but with a warm dedomed XPL. I adjusted their powers so their beam intensities were equal. The second photo is just meant to show the color difference. I lowered the powers to arbitrary values for the second photo.
It was not foggy out, but in the beam you can easily see very small water particles floating around. It is a 5s exposure. I think the amount of scattered light looks the same. So, again, if the air is actually very very clear the cool light will scatter more, but with any particles in the air the light will scatter a lot more, and it will be the same for warm or cool light.
