diff --git a/build-number.txt b/build-number.txt
index 658bd78..b283aee 100644
--- a/build-number.txt
+++ b/build-number.txt
@@ -1 +1 @@
-459
+482
diff --git a/src/light_sensor.c b/src/light_sensor.c
index 3cc495b..ebdfb95 100644
--- a/src/light_sensor.c
+++ b/src/light_sensor.c
@@ -4,11 +4,7 @@ volatile unsigned int LightSensor_Measurement;
 volatile bool LightSensor_NewMeasurement = false;
 
 // Rolling average of the brightness measurement
-unsigned int LightSensor_AbsoluteBrightness = LIGHTSENSOR_MAX / 2;
-
-// Maximum and minimum encountered so far
-unsigned int LightSensor_MinimumBrightness = LIGHTSENSOR_MAX;
-unsigned int LightSensor_MaximumBrightness = 0;
+unsigned int LightSensor_AbsoluteBrightness = 0;
 
 int LightSensor_RelativeBrightness;
 
@@ -68,29 +64,16 @@ void LightSensor_Poll(void)
         LightSensor_NewMeasurement = false;
         unsigned int brightness = ((1 << 31)
             / (measurement + 1)) >> (31 - 16);
-        // LightSensor_AbsoluteBrightness = LIGHTSENSOR_LAMBDA * LightSensor_AbsoluteBrightness
-        //     + (1.0f - LIGHTSENSOR_LAMBDA) * brightness;
-        LightSensor_AbsoluteBrightness -= LightSensor_AbsoluteBrightness >> LIGHTSENSOR_LAMBDA_BITS;
-        LightSensor_AbsoluteBrightness += brightness >> LIGHTSENSOR_LAMBDA_BITS;
+        LightSensor_AbsoluteBrightness -= LightSensor_AbsoluteBrightness
+            >> LIGHTSENSOR_LAMBDA_BITS;
+        LightSensor_AbsoluteBrightness += brightness
+            >> LIGHTSENSOR_LAMBDA_BITS;
 
-        if(brightness < LightSensor_MinimumBrightness)
-        {
-            LightSensor_MinimumBrightness = brightness;
-        }
-        if(brightness > LightSensor_MaximumBrightness)
-        {
-            LightSensor_MaximumBrightness = brightness;
-        }
+        LightSensor_RelativeBrightness =
+            ((int)LightSensor_AbsoluteBrightness - LIGHTSENSOR_LOW_BOUND)
+            * LIGHTSENSOR_MAX
+            / (LIGHTSENSOR_HIGH_BOUND - LIGHTSENSOR_LOW_BOUND);
 
-        // Scale and saturate to get relative brightness value
-        int range = LightSensor_MaximumBrightness
-            - LightSensor_MinimumBrightness;
-        int low = LightSensor_MinimumBrightness
-            + LIGHTSENSOR_LOW_BOUND * range / LIGHTSENSOR_MAX;
-        int high = LightSensor_MinimumBrightness
-            + LIGHTSENSOR_HIGH_BOUND * range / LIGHTSENSOR_MAX;
-        LightSensor_RelativeBrightness = ((int)LightSensor_AbsoluteBrightness - low)
-            * LIGHTSENSOR_MAX / (high - low);
         if(LightSensor_RelativeBrightness < 0)
         {
             LightSensor_RelativeBrightness = 0;
@@ -99,17 +82,6 @@ void LightSensor_Poll(void)
         {
             LightSensor_RelativeBrightness = LIGHTSENSOR_MAX;
         }
-
-        // Slowly reset limit values
-        static int decay_counter = 0;
-        decay_counter++;
-        if(decay_counter == LIGHTSENSOR_LIMIT_RESET_TIME * 1000
-            / LIGHTSENSOR_INTERVAL / LIGHTSENSOR_MAX)
-        {
-            decay_counter = 0;
-            LightSensor_MaximumBrightness -= 1;
-            LightSensor_MinimumBrightness += 1;
-        }
     }
 }
 
diff --git a/src/light_sensor.h b/src/light_sensor.h
index 2331eae..fceb452 100644
--- a/src/light_sensor.h
+++ b/src/light_sensor.h
@@ -15,14 +15,10 @@
 // 'Forgetting factor' of the rolling brightness average
 #define LIGHTSENSOR_LAMBDA_BITS 2
 
-// Time until minimum and maximum value are completely reset (in seconds)
-#define LIGHTSENSOR_LIMIT_RESET_TIME \
-                                (48 * 60 * 60)
-
-// Bounds for converting absolute to relative brightness: Consider everything
-// near the minimum or maximum 0.0 or 1.0, respectively
-#define LIGHTSENSOR_LOW_BOUND   ((unsigned int)(0.013 * LIGHTSENSOR_MAX))
-#define LIGHTSENSOR_HIGH_BOUND  ((unsigned int)(1.0 * LIGHTSENSOR_MAX))
+// Bounds for converting absolute to relative brightness (empirically
+// determined)
+#define LIGHTSENSOR_LOW_BOUND   ((int)(0.003 * LIGHTSENSOR_MAX))
+#define LIGHTSENSOR_HIGH_BOUND  ((int)(0.65 * LIGHTSENSOR_MAX))
 
 extern int LightSensor_RelativeBrightness;