diff --git a/apps/abstraction/transformation.py b/apps/abstraction/transformation.py
index cdadac8..37516f9 100644
--- a/apps/abstraction/transformation.py
+++ b/apps/abstraction/transformation.py
@@ -55,9 +55,13 @@ def _transform_thermostat_simulator_to_abstract(payload: dict[str, Any]) -> dict
 def _transform_light_zigbee2mqtt_to_vendor(payload: dict[str, Any]) -> dict[str, Any]:
     """Transform abstract light payload to zigbee2mqtt format.
     
-    zigbee2mqtt uses 'state' instead of 'power':
+    Transformations:
+    - power: 'on'/'off' -> state: 'ON'/'OFF'
+    - brightness: 0-100 -> brightness: 0-254
+    
+    Example:
     - Abstract: {'power': 'on', 'brightness': 100}
-    - zigbee2mqtt: {'state': 'ON', 'brightness': 100}
+    - zigbee2mqtt: {'state': 'ON', 'brightness': 254}
     """
     vendor_payload = payload.copy()
     
@@ -66,14 +70,25 @@ def _transform_light_zigbee2mqtt_to_vendor(payload: dict[str, Any]) -> dict[str,
         power_value = vendor_payload.pop("power")
         vendor_payload["state"] = power_value.upper() if isinstance(power_value, str) else power_value
     
+    # Transform brightness: 0-100 (%) -> 0-254 (zigbee2mqtt range)
+    if "brightness" in vendor_payload:
+        abstract_brightness = vendor_payload["brightness"]
+        if isinstance(abstract_brightness, (int, float)):
+            # Convert percentage (0-100) to zigbee2mqtt range (0-254)
+            vendor_payload["brightness"] = round(abstract_brightness * 254 / 100)
+    
     return vendor_payload
 
 
 def _transform_light_zigbee2mqtt_to_abstract(payload: dict[str, Any]) -> dict[str, Any]:
     """Transform zigbee2mqtt light payload to abstract format.
     
-    zigbee2mqtt uses 'state' instead of 'power':
-    - zigbee2mqtt: {'state': 'ON', 'brightness': 100}
+    Transformations:
+    - state: 'ON'/'OFF' -> power: 'on'/'off'
+    - brightness: 0-254 -> brightness: 0-100
+    
+    Example:
+    - zigbee2mqtt: {'state': 'ON', 'brightness': 254}
     - Abstract: {'power': 'on', 'brightness': 100}
     """
     abstract_payload = payload.copy()
@@ -83,6 +98,13 @@ def _transform_light_zigbee2mqtt_to_abstract(payload: dict[str, Any]) -> dict[st
         state_value = abstract_payload.pop("state")
         abstract_payload["power"] = state_value.lower() if isinstance(state_value, str) else state_value
     
+    # Transform brightness: 0-254 (zigbee2mqtt range) -> 0-100 (%)
+    if "brightness" in abstract_payload:
+        vendor_brightness = abstract_payload["brightness"]
+        if isinstance(vendor_brightness, (int, float)):
+            # Convert zigbee2mqtt range (0-254) to percentage (0-100)
+            abstract_payload["brightness"] = round(vendor_brightness * 100 / 254)
+    
     return abstract_payload