init.lua

local brightness = 50

function onAwake(eventType) 
	if eventType == hs.caffeinate.watcher.systemDidWake or eventType == hs.caffeinate.watcher.screensDidUnlock then
		print("awake----------")
		hs.brightness.set(brightness)
	elseif eventType == hs.caffeinate.watcher.screensDidSleep then
		print("screensDidSleep----------")
		brightness = hs.brightness.get()
	end
end 

local watcher = hs.caffeinate.watcher.new(onAwake)
watcher:start()