math.random Color3 help?

I was trying to make it so it changes to a random color within a range of (255 - 200) so they can I always be a neon color, What am I doing wrong??

sp = script.Parent
NUM1 = sp.NUM1
while true do
	NUM1:TweenSize(UDim2.new(0, 800,0,math.random(-600,0)),"Out","Linear",0.1,false)
	NUM1.BackgroundColor3 = Color3.new(math.random(255,200)/255,math.random(255,200)/255,math.random(255,200)/255)
	wait(0.05)
end

as GoldPhysics mentioned, math.random requires the first parameter to be smaller than the second.

math.random(200,255) is therefore valid, but what you have, math.random(255,200) is not. The output would state this.