Help with Color3Value? [SOLVED]

Alright so I have this script and i want the colourOn variable to be connected to a Color3Value so I can change the color through the Color3Value. Can someone help me? I know it needs to be divided by 255 on each value, But how would I do that?

colourOn = Color3.new(0, 0, 0) --Where the Color3Value should go
colourOff = Color3.new(0, 0, 0)

while true do
    c = script.Parent.LightUp:GetChildren()
    for i = 1, #c do
        if math.random() > 0.5 then
            c[i].Color = colourOn
        else
            c[i].Color = colourOff
        end
    end
    wait(0.2) 
end 

Sorry if it's a little confusing, It's hard to explain.