In photoshop it would appear at 255 but in game it should almost never reach that high. You are simulating it in a world with lighting rules that need to work. So in the ABSOLUTE perfect lighting scenario in game it is possible a part of it can hit 255 but not over the entire sign. Shadows, reflection, atmosphere, light sources would cause it to fade and change. EXAMPLE: Coke Sign in Photoshop Coke Sign in Real Life Granted that is a faded sign but you can see how the absolute color of 255 isn't realistic to render in pictures or games trying to look like pictures aka real life. White can never be full white, red never full red, blue, green etc.