diff --git a/gate_guard/gate.py b/gate_guard/gate.py
index 22e6166..74fab8b 100644
--- a/gate_guard/gate.py
+++ b/gate_guard/gate.py
@@ -5,6 +5,7 @@ Created on Dec 19, 2016
 '''
 import datetime
 import logging
+import pytz
 import socket
 import ssl
 import time
@@ -14,6 +15,8 @@ import gate_guard.light_sensor
 import gate_guard.engine
 import gate_guard.power_sensor
 
+from astral import Astral
+
 STATE_INIT_1 = "init_1"
 STATE_INIT_2 = "init_2"
 STATE_INIT_3 = "init_3"
@@ -67,6 +70,25 @@ def check_to_close(light_avg):
         ret = True
     return ret
 
+class FakeLight(object):
+    '''Simulate light sensor time based in order to eliminate defect light sensor.'''
+    def __init__(self, bus, addr):
+        self.astral = Astral()
+        self.astral.solar_depression = 'civil'
+        self.city = self.astral['Berlin']
+        self.opening_hour = 8
+
+    def read(self):
+        fake_light = 0
+        now = datetime.datetime.now(pytz.timezone(self.city.timezone))
+
+        sun = self.city.sun(now, local=True)
+        sunset = sun['sunset']
+
+        if now.hour >= self.opening_hour and now < sunset:
+                fake_light = 1
+        return fake_light
+
 
 class Gate(object):
     '''Main class of the chickenhouse gates.'''
@@ -83,8 +105,9 @@ class Gate(object):
                                 STATE_CLOSING_2:self.__closing_2_handler}
         self.__next_state = STATE_INIT_1
         self.__last_state = STATE_OPENED
-        self.__light_sensor = gate_guard.light_sensor.LightSensor(
-            LIGHT_SENSOR_I2C_BUS, LIGHT_SENSOR_I2C_ADDRESS)
+#        self.__light_sensor = gate_guard.light_sensor.LightSensor(
+#            LIGHT_SENSOR_I2C_BUS, LIGHT_SENSOR_I2C_ADDRESS)
+        self.__light_sensor = FakeLight(LIGHT_SENSOR_I2C_BUS, LIGHT_SENSOR_I2C_ADDRESS)
         self.__light_data = gate_guard.data_buffer.DataBuffer(
             LIGHT_CONSECUTIVE_READS)
         self.__engine_1 = gate_guard.engine.Engine(gpio_1=ENGINE_1_PIN_1, gpio_2=ENGINE_1_PIN_2)