diff --git a/homeassistant/components/zha/sensor.py b/homeassistant/components/zha/sensor.py
index 94f57ed9a0b15e..b2d246c30959f0 100644
--- a/homeassistant/components/zha/sensor.py
+++ b/homeassistant/components/zha/sensor.py
@@ -24,6 +24,13 @@ def pass_through_formatter(value):
     return value
 
 
+def illuminance_formatter(value):
+    """Convert Illimination data."""
+    if value is None:
+        return None
+    return round(pow(10, ((value - 1) / 10000)), 1)
+
+
 def temperature_formatter(value):
     """Convert temperature data."""
     if value is None:
@@ -58,6 +65,7 @@ def pressure_formatter(value):
     TEMPERATURE: temperature_formatter,
     PRESSURE: pressure_formatter,
     ELECTRICAL_MEASUREMENT: active_power_formatter,
+    ILLUMINANCE: illuminance_formatter,
     GENERIC: pass_through_formatter,
 }
 
diff --git a/tests/components/zha/test_sensor.py b/tests/components/zha/test_sensor.py
index ec6af7f4aa196d..cd8f4ba72b2d37 100644
--- a/tests/components/zha/test_sensor.py
+++ b/tests/components/zha/test_sensor.py
@@ -139,7 +139,7 @@ async def async_test_pressure(hass, device_info):
 async def async_test_illuminance(hass, device_info):
     """Test illuminance sensor."""
     await send_attribute_report(hass, device_info["cluster"], 0, 10)
-    assert_state(hass, device_info, '10', 'lx')
+    assert_state(hass, device_info, '1.0', 'lx')
 
 
 async def async_test_metering(hass, device_info):