diff --git a/apps/home/main.py b/apps/home/main.py
index a8fdc11..67ebdb5 100644
--- a/apps/home/main.py
+++ b/apps/home/main.py
@@ -71,11 +71,11 @@ def draw_wifi(back_colour, rssi, connected, connecting, win_wifi):
 def backlight_adjust():
 	if ugfx.backlight() == 0:
 		ugfx.power_mode(ugfx.POWER_ON)
-	l = pyb.ADC(16).read()
-	if (l > 90):
-		ugfx.backlight(100)
-	elif (l > 20):
-		ugfx.backlight(70)
+	l = onboard.get_light()
+
+	lum_percent = int(l * 100 / 4096)
+	if (lum_percent > 30):
+		ugfx.backlight(lum_percent)
 	else:
 		ugfx.backlight(30)
 
@@ -298,11 +298,9 @@ def home_main():
 				inactivity_limit = 120
 			else:
 				inactivity_limit = 30
-			if battery_percent > 120:  #if charger plugged in
-				if ugfx.backlight() == 0:
-					ugfx.power_mode(ugfx.POWER_ON)
-				ugfx.backlight(100)
-			elif inactivity > inactivity_limit:
+
+			# If charger is not plugged in and we're inactive, turn screen off
+			if battery_percent < 120 and inactivity > inactivity_limit:
 				low_power()
 			else:
 				backlight_adjust()