diff --git a/clock.py b/clock.py
index 0b6d80a..6cbcfb3 100644
--- a/clock.py
+++ b/clock.py
@@ -11,7 +11,7 @@ from kivy.properties import ObjectProperty
 import time
 from sounds import WakeUpSounds
 import json
-from hsluv import hsluv_to_rgb
+from hsluv import hsluv_to_rgb, rgb_to_hsluv
 
 def is_arm():
     if (uname()[4][:3] == 'arm') or (uname()[4][:7] == 'aarch64'):
@@ -627,10 +627,66 @@ class MyClockWidget(FloatLayout):
         elif intensity > 1:
             intensity = 1
 
-        h = max(0, min(75, (75 - 12) * intensity + 12))
-        s = max(0, min(100, 250 - 250 * intensity))
-        l = 100 * intensity
+        # sunlight intensity and color temperature vary with sine function
+        intensity = math.sin(2 * math.pi * intensity / 4)
 
+        # from https://tannerhelland.com/2012/09/18/convert-temperature-rgb-algorithm-code.html
+        # usable between 1000 and 40000 K
+
+        # we only want color temperatures between 2000 and 6500 K
+        CCT = 2000 + (6500 - 2000) * intensity
+
+        if CCT < 1000:
+            CCT = 1000
+        if CCT > 40000:
+            CCT = 40000
+
+        Temperature = CCT / 100
+
+        if Temperature <= 66:
+            Red = 255
+        else:
+            Red = Temperature - 60
+            Red = 329.698727446 * pow(Red, -0.1332047592)
+            if Red < 0:
+                Red = 0
+            if Red > 255:
+                Red = 255
+
+        if Temperature <= 66:
+            Green = Temperature
+            Green = 99.4708025861 * math.log(Green) - 161.1195681661
+            if Green < 0:
+                Green = 0
+            if Green > 255:
+                Green = 255
+        else:
+            Green = Temperature - 60
+            Green = 288.1221695283 * pow(Green, -0.0755148492)
+            if Green < 0:
+                Green = 0
+            if Green > 255:
+                Green = 255
+
+        if Temperature >= 66:
+            Blue = 255
+        else:
+            if Temperature <= 19:
+                Blue = 0
+            else:
+                Blue = Temperature - 10
+                Blue = 138.5177312231 * math.log(Blue) - 305.0447927307
+                if Blue < 0:
+                    Blue = 0
+                if Blue > 255:
+                    Blue = 255
+
+        rgb_cct = [Red / 255, Green / 255, Blue / 255]
+
+        # adjust intensity
+        [h, s, l]= rgb_to_hsluv(rgb_cct)
+
+        l = l * intensity
         rgb = hsluv_to_rgb([h, s, l])
 
         return rgb
diff --git a/settings.json b/settings.json
index 39a2382..b268727 100644
--- a/settings.json
+++ b/settings.json
@@ -1,11 +1,11 @@
 {
-    "theme": "Light",
-    "volume": 13,
-    "wake_up_sound": "NPO Radio 1",
-    "wake_up_brightness": 4,
-    "reading_light_brightness": 13,
-    "display_brightness": 13,
-    "alarm_activated": true,
-    "alarm_time_hour": 6,
-    "alarm_time_minute": 57
+    "theme": "Automatic",
+    "volume": 1,
+    "wake_up_sound": "Birds",
+    "wake_up_brightness": 20,
+    "reading_light_brightness": 2,
+    "display_brightness": 20,
+    "alarm_activated": false,
+    "alarm_time_hour": 9,
+    "alarm_time_minute": 9
 }
\ No newline at end of file