diff --git a/build-number.txt b/build-number.txt
index 055b667..77afe23 100644
--- a/build-number.txt
+++ b/build-number.txt
@@ -1 +1 @@
-507
+509
diff --git a/src/light_sensor.h b/src/light_sensor.h
index fceb452..da9f234 100644
--- a/src/light_sensor.h
+++ b/src/light_sensor.h
@@ -17,8 +17,8 @@
 
 // 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))
+#define LIGHTSENSOR_LOW_BOUND   5
+#define LIGHTSENSOR_HIGH_BOUND  ((int)(0.85 * LIGHTSENSOR_MAX))
 
 extern int LightSensor_RelativeBrightness;