diff --git a/LaserClock/LaserClock.ino b/LaserClock/LaserClock.ino
index 991d688..c29d6b8 100644
--- a/LaserClock/LaserClock.ino
+++ b/LaserClock/LaserClock.ino
@@ -3,7 +3,7 @@
  *
  * Program for a binary laser clock
  *
- * Setup: a Button on pin 12, Led pin 13, Laser / LED on pin 2-11 needs to be pwm! RTC-Modul DS3231 required
+ * Setup: a Button on pin 12, Led pin 13, Laser / LED on pin 2-11 needs to be pwm! RTC-Modul DS3231 required, AmbientLightSensor on pin A0
  *
  */
 #include <Wire.h>
@@ -12,6 +12,9 @@
 DS3231 clock;
 
 #define pressed digitalRead(12) == LOW
+#define lightoff 1010
+#define lighton 970
+const unsigned char lightSensPin;
 
 //pins for hour display
 const unsigned char H[] = {8,9,10,11};
@@ -19,15 +22,26 @@ const unsigned char H[] = {8,9,10,11};
 const unsigned char M[] = {2,3,4,5,6,7};
 
 //intensity of laser, when "off": 0 -> 0% on; 255 -> 100% on
-const unsigned int offtime = 160;
+const unsigned int offtime = 170;
+
+//lowbrightnes values
+const unsigned char offtime_lb = 140;
+const unsigned char ontime_lb = 185;
+
+bool brightmode = true;
 
 bool houtremp;
 
 void set(const unsigned char pin, bool on) {
-  if(on)
-    digitalWrite(pin, HIGH);
-  else
-    analogWrite(pin, offtime);
+  if(on) {
+    if(brightmode) {
+      digitalWrite(pin, HIGH);
+    } else {
+      analogWrite(pin, ontime_lb);
+    }
+  } else {
+    analogWrite(pin, brightmode ? offtime : offtime_lb);
+  }
 }
 
 //prints the data to the lasers, write(0,0)-> all off, write()-> all on
@@ -119,4 +133,10 @@ void loop() {
   digitalWrite(13, millis()/1000 % 2 == 0);
     
   delay(500);
+  int brightness = analogRead(A0);
+  if(brightness < lighton) {
+    brightmode = true;
+  } else if(brightness > lightoff) {
+    brightmode = false;
+  }
 }