diff --git a/assets/locales/en/terrarum.json b/assets/locales/en/terrarum.json
index 6967c092d..bfb4ffeef 100644
--- a/assets/locales/en/terrarum.json
+++ b/assets/locales/en/terrarum.json
@@ -33,6 +33,7 @@
   "MENU_OPTIONS_DEBUG_CONSOLE": "Debug Console",
   "MENU_OPTIONS_DITHER": "Dithering",
   "MENU_OPTIONS_JVM_HEAP_MAX": "Max Heap Memory",
+  "MENU_OPTIONS_LIGHT_UPDATE_PASSES": "Light Calculation Depth",
   "MENU_OPTIONS_NOTIFICATION_DISPLAY_DURATION": "Show notification for",
   "MENU_OPTIONS_PARTICLES": "Particles",
   "MENU_OPTIONS_PERFORMANCE": "Performance",
diff --git a/assets/locales/koKR/terrarum.json b/assets/locales/koKR/terrarum.json
index f1f413dd1..00480da80 100644
--- a/assets/locales/koKR/terrarum.json
+++ b/assets/locales/koKR/terrarum.json
@@ -33,6 +33,7 @@
   "MENU_OPTIONS_DEBUG_CONSOLE": "디버그 콘솔",
   "MENU_OPTIONS_DITHER": "디더링",
   "MENU_OPTIONS_JVM_HEAP_MAX": "최대 힙 메모리",
+  "MENU_OPTIONS_LIGHT_UPDATE_PASSES": "빛 계산 반복 횟수",
   "MENU_OPTIONS_NOTIFICATION_DISPLAY_DURATION": "알림 표시 시간",
   "MENU_OPTIONS_PARTICLES": "입자 수",
   "MENU_OPTIONS_PERFORMANCE": "성능",
diff --git a/src/net/torvald/terrarum/DefaultConfig.kt b/src/net/torvald/terrarum/DefaultConfig.kt
index 68e781843..5f3dee698 100644
--- a/src/net/torvald/terrarum/DefaultConfig.kt
+++ b/src/net/torvald/terrarum/DefaultConfig.kt
@@ -128,6 +128,8 @@ object DefaultConfig {
             "bgmvolume" to 1.0,
             "sfxvolume" to 1.0,
 
+            "lightpasses" to 2,
+
 
 
             // settings regarding debugger
diff --git a/src/net/torvald/terrarum/modulebasegame/ui/UIPerformanceControlPanel.kt b/src/net/torvald/terrarum/modulebasegame/ui/UIPerformanceControlPanel.kt
index bf0648711..135b748c6 100644
--- a/src/net/torvald/terrarum/modulebasegame/ui/UIPerformanceControlPanel.kt
+++ b/src/net/torvald/terrarum/modulebasegame/ui/UIPerformanceControlPanel.kt
@@ -31,6 +31,7 @@ class UIPerformanceControlPanel(remoCon: UIRemoCon?) : UICanvas() {
                 arrayOf("notificationshowuptime", { Lang["MENU_OPTIONS_NOTIFICATION_DISPLAY_DURATION"] + " (${Lang["CONTEXT_TIME_SECOND_PLURAL"]})" }, "spinnerimul,2,10,1,1000"),
             arrayOf("", { Lang["MENU_LABEL_GRAPHICS"] }, "h1"),
                 arrayOf("atlastexsize", { Lang["MENU_OPTIONS_ATLAS_TEXTURE_SIZE"] }, "spinnersel,1024,2048,4096,8192"),
+                arrayOf("lightpasses", { Lang["MENU_OPTIONS_LIGHT_UPDATE_PASSES"] }, "spinner,2,8,1"),
             arrayOf("", { Lang["MENU_LABEL_JVM_DNT"] }, "h1"),
                 arrayOf("jvm_xmx", { Lang["MENU_OPTIONS_JVM_HEAP_MAX"] + " (GB)" }, "spinner,2,32,1"),
                 arrayOf("jvm_extra_cmd", { Lang["MENU_LABEL_EXTRA_JVM_ARGUMENTS"] }, "typein"),
diff --git a/src/net/torvald/terrarum/worlddrawer/LightmapRenderer.kt b/src/net/torvald/terrarum/worlddrawer/LightmapRenderer.kt
index ec06648ba..da21bb78c 100644
--- a/src/net/torvald/terrarum/worlddrawer/LightmapRenderer.kt
+++ b/src/net/torvald/terrarum/worlddrawer/LightmapRenderer.kt
@@ -341,6 +341,16 @@ object LightmapRenderer {
 //            }
             // no rendering trickery will eliminate the need of 2nd pass, even the "decay out"
         }
+
+        App.getConfigInt("lightpasses").let { passcnt ->
+            if (passcnt > 2) {
+                for (pass in 3..passcnt) {
+                    App.measureDebugTime("Renderer.LightRuns$pass") {
+                        r1(lightmap);r2(lightmap);r3(lightmap);r4(lightmap)
+                    }
+                }
+            }
+        }
     }
 
     private fun buildLanternAndShadowMap(actorContainer: List<ActorWithBody>) {