How can I make fading/flashing Beam?

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To make a light flash, you have to disable then re-enable it. Put this script inside the part where the SpotLight is:

local time1 = 1 --This is how long you have to wait in seconds for the light to turn off again
local time2 = 1 --This is how long you have to wait in seconds for the light to turn back on
local light = script.Parent.SpotLight --Change this to your needs

while wait(time1) do

    light.Enabled = false --Turns light off

    wait(time2)

    light.Enabled = true --Turns light on

end

To make a light fade you have to slowly turn its brightness off or on. You can use the Tween Service (smoother) or a loop (easier) for that:

Loop:

local brightness = 1 --The original brightness value, usually 1
local light = script.Parent.SpotLight

--Fading out:
repeat wait(0.1) --How fast the fading is

    light.Brightness = light.Brightness - 0.01

until light.Brightness == 0

--Fading in:
repeat wait(0.1) --How fast the fading is

    light.Brightness = light.Brightness + 0.01

until light.Brightness == brightness

TweenService:

local brightness = 1
local light = script.Parent.SpotLight
local goal = {}
local TW = game.TweenService
local tweenInfo = TweenInfo.new(1) --How fast the fading is in seconds

--Fading out:
goal.Brightness = 0
local tween = TW:Create(light, tweenInfo, goal)
tween:Play()

--Fading in:
goal.Brightness = brightness
local tween = TW:Create(light, tweenInfo, goal)
tween:Play()

Sorry for my English and let me know if I helped

https://gyazo.com/e25b12d440423e9ebcaf285e5d0bacd3- I was on about the Beam but like using light is really helpful too.