Changing a light's colour would be:
local lt = script.Parent.PointLight
while true do
lt.Color = BrickColor.new(math.random(0,255),255,math.random(0,255),255,math.random(0,255),255)
wait(0.2)
end
-- im new and it seems fine to me :/
local lt = script.Parent.PointLight
while true do
lt.Color = BrickColor.new(math.random(0,255)/255,math.random(0,255)/255,math.random(0,255)/255)
wait(0.2)
end