Probably fixes problems with darksight outdoors

code/modules/planet/planet.dm

@@ -13,7 +13,7 @@
 	var/datum/sun_holder/sun_holder
 
 	var/sun_position = 0 // 0 means midnight, 1 means noon.
-	var/list/sun = list("range","brightness","color")
+	var/list/sun = list("brightness","color")
 	var/list/expected_z_levels = list()
 
 	var/turf/unsimulated/wall/planetary/planetary_wall_type = /turf/unsimulated/wall/planetary
@@ -62,8 +62,7 @@
 	if(weather_holder)
 		weather_holder.process()
 
-/datum/planet/proc/update_sun_deferred(var/new_range, var/new_brightness, var/new_color)
-	sun["range"] = new_range
+/datum/planet/proc/update_sun_deferred(var/new_brightness, var/new_color)
 	sun["brightness"] = new_brightness
 	sun["color"] = new_color
 	needs_work |= PLANET_PROCESS_SUN

code/modules/planet/sif.dm

@@ -95,7 +95,7 @@ var/datum/planet/sif/planet_sif = null
 		new_color = rgb(new_r, new_g, new_b)
 
 	spawn(1)
-		update_sun_deferred(2, new_brightness, new_color)
+		update_sun_deferred(new_brightness, new_color)
 
 // We're gonna pretend there are 32 hours in a Sif day instead of 32.64 for the purposes of not losing sanity.  We lose 38m 24s but the alternative is a path to madness.
 /datum/time/sif

code/modules/planet/sun.dm

@@ -2,26 +2,50 @@
 	var/atom/movable/sun_visuals/sun = new
 	var/datum/planet/our_planet
 
+	var/our_color = "#FFFFFF"
+	var/our_brightness = 1.0
+
 /datum/sun_holder/New(var/source)
 	our_planet = source
 
 /datum/sun_holder/proc/update_color(new_color)
-	sun.color = new_color
-
-/datum/sun_holder/proc/update_brightness(new_brightness)
-	sun.alpha = round(CLAMP01(new_brightness)*255,1)
+	// Doesn't save much work, but might save a smidge of client work
+	if(our_color == new_color)
+		return
+	
+	// Visible change
+	sun.color = our_color = new_color
 
+/datum/sun_holder/proc/update_brightness(new_brightness, list/turfs)
+	// Doesn't save much work, but might save a smidge of client work
+	if(our_brightness == new_brightness)
+		return
+	
+	// Store the old for math
+	. = our_brightness
+	our_brightness = new_brightness
+	
+	// Visible change
+	sun.alpha = round(CLAMP01(our_brightness)*255,1)
+	
+	// Update dynamic lumcount so darksight and stuff works
+	var/difference = . - our_brightness
+	for(var/turf/T as anything in turfs)
+		T.dynamic_lumcount -= difference
+	
 /datum/sun_holder/proc/apply_to_turf(turf/T)
 	if(sun in T.vis_contents)
 		warning("Was asked to add fake sun to [T.x], [T.y], [T.z] despite already having us in it's vis contents")
 		return
 	T.vis_contents += sun
+	T.dynamic_lumcount += our_brightness
 
 /datum/sun_holder/proc/remove_from_turf(turf/T)
 	if(!(sun in T.vis_contents))
 		warning("Was asked to remove fake sun from [T.x], [T.y], [T.z] despite it not having us in it's vis contents")
 		return
 	T.vis_contents -= sun
+	T.dynamic_lumcount -= our_brightness
 
 /datum/sun_holder/proc/rainbow()
 	var/end = world.time + 30 SECONDS

code/modules/planet/virgo3b_vr.dm

@@ -94,7 +94,7 @@ var/datum/planet/virgo3b/planet_virgo3b = null
 		new_color = rgb(new_r, new_g, new_b)
 
 	spawn(1)
-		update_sun_deferred(2, new_brightness, new_color)
+		update_sun_deferred(new_brightness, new_color)
 
 
 /datum/weather_holder/virgo3b

code/modules/planet/virgo4_vr.dm

@@ -92,7 +92,7 @@ var/datum/planet/virgo4/planet_virgo4 = null
 		new_color = rgb(new_r, new_g, new_b)
 
 	spawn(1)
-		update_sun_deferred(2, new_brightness, new_color)
+		update_sun_deferred(new_brightness, new_color)
 
 
 /datum/weather_holder/virgo4