Air alarm fixes, final part. Added in area atmos lockdown, proper overrides from the atmos control computer, cycling airlocks, and minor airflow/ZAS tweaks.

code/modules/power/lighting.dm

@@ -92,7 +92,7 @@
 					broken(1)
 			if("bulb")
 				brightness = rand(BULB_BRIGHT_MIN, BULB_BRIGHT_MAX)
-				if(prob(15))
+				if(prob(20))
 					broken(1)
 		spawn(1)
 			update()
@@ -127,7 +127,7 @@
 	var/oldlum = luminosity
 
 	//luminosity = on * brightness
-	ul_SetLuminosity(on * brightness, on * brightness, ( fitting != "bulb" ? on * brightness  : round(on*brightness/2 + 1)  ) )		// *DAL*
+	ul_SetLuminosity(on * brightness, on * brightness, fitting != "bulb" ? on * brightness : max(on * (brightness - 2), 0) )		// *DAL*
 
 	// if the state changed, inc the switching counter
 	if(oldlum != luminosity)