How do I make dynamic lighting flash and flicker?

pl = Instance.new("PointLight",workspace["Part Name"])
pl.Range = 30 -- how far the light will reach
pl.Brightness = 1 -- how bright the light is
while wait() do
    for i=30,1,-1 do
        pl.Range = i
        wait()
    end
    for i=1,30,1 do
        pl.Range = i
        wait()
    end
end

that will make the light pulse just replace Part Name with the Name of the part you want to light up if you have any questions about the script feel free to ask as a comment

If you want it to kind of like go off and on randomly like a broken light or lightning or something then just do a loop that turns it off and on at "random" intervals.

You would put this script as a child under the part that parents the point light

Light = script.Parent.PointLight

while true do
    Light.Enabled = false
    wait(0.1)
    Light.Enabled = true
    wait(0.4)
    Light.Enabled = false
    wait(0.789)
    Light.Enabled = true
    wait(0.29)
    Light.Enabled = false
    wait(0.025)
    Light.Enabled = true
    wait(0.07)
end

There's probably a quicker and more efficient way, but yeah :P Just change the wait times to be shorter or longer to your liking. And, if you want it to seem more random then just add tons and tons more of those to the loop lol Also next time you ask a question, you should probably like say that you've at least tried to make the script yourself. A lot of questions get downvoted and removed because all it has is a question to make a script.