0.900 0.000 0.000 1.000
Not really sure why it's like that but there's two types of color systems, ColorI(0-255) and ColorF(0-1) - A simple way to think of this is Color Integer and Color Float, in some situations one of them is better than the other, but one of my guesses is that it's much easier to use ColorF if you're doing something like "0.5 0.5 0.5 1" instead of trying to do something like "140 140 140 255"Either way in general it doesn't matter which one you use as long as you know what you're doing.
multiply by 255 and round