So far, I can achieve a blue that fades softly with while true do:
while true do
wait()
game.Lighting.Blur.Size = game.Lighting.Blur.Size + 1
end
That get's the effect I want, but it keeps increasing the Size value and creates lag and I can't get it to stop at a certain number I also tried doing repeat until, that doesn't work. It does not have a fading effect I want. Does anyone know a method?

2 comments
What is your target blur size? At what point do you want the script to stop telling it to increase.
24, the preset one.