diff --git a/src/engine.py b/src/engine.py
index 0816805..32c3800 100644
--- a/src/engine.py
+++ b/src/engine.py
@@ -4,20 +4,18 @@ import math
 
 from models import (
     EngineFixture,
-    EngineKeyframe,
     EngineTrack,
     Flickr,
+    FlickrApiInterface,
     Interpolation,
-    Keyframe,
     KeyframeValue,
-    Parameter,
 )
 
 
 class Engine:
     """Render a lightshow."""
 
-    def __init__(self, flickr: Flickr, apis: dict[str, str]) -> None:
+    def __init__(self, flickr: Flickr, apis: dict[str, FlickrApiInterface]) -> None:
         self.apis = apis
         self.flickr = flickr
         self.tracks: list[EngineTrack] = []
@@ -90,7 +88,7 @@ class Engine:
         """Forward new fixture states to APIs."""
         for f in self.fixtures.values():
             api = self.apis[f.fixture.api]
-            # TODO: Pass update to API
+            api.update_fixture(f)
 
     def get_current_value(self, track: EngineTrack) -> KeyframeValue:
         """Interpolate between current keyframes of track and return the interpolated value."""
diff --git a/src/hue.py b/src/hue.py
new file mode 100644
index 0000000..5b530db
--- /dev/null
+++ b/src/hue.py
@@ -0,0 +1,33 @@
+import logging
+from models import Capabilities, EngineFixture, FlickrApiInterface
+from phue import Bridge
+
+
+class HueApi(FlickrApiInterface):
+    def __init__(self, ip: str) -> None:
+        super().__init__()
+        self.bridge = Bridge(ip)
+        self.bridge.connect()
+
+    def update_fixture(self, fixture: EngineFixture) -> bool:
+        command = {
+            "on": bool(fixture.on),
+            "transitiontime": int(fixture.transition * 10),
+        }
+
+        # Set values based on capabilities
+        if fixture.fixture.capabilities in [
+            Capabilities.BRIGHTNESS,
+            Capabilities.COLOR,
+            Capabilities.TEMPERATURE,
+        ]:
+            command["bri"] = fixture.brightness * 255
+        if fixture.fixture.capabilities in [Capabilities.COLOR]:
+            command["sat"] = fixture.brightness * 255
+            command["hue"] = fixture.hue * 65535
+        if fixture.fixture.capabilities in [Capabilities.TEMPERATURE]:
+            command["ct"] = fixture.temperature
+
+        # Apply update
+        self.bridge.set_light(fixture.fixture.api_id, command)
+        return True
diff --git a/src/models.py b/src/models.py
index cc7693e..c4040d4 100644
--- a/src/models.py
+++ b/src/models.py
@@ -87,16 +87,16 @@ class EngineFixture:
     """On state."""
 
     brightness: float = 0
-    """Brightness state."""
+    """Brightness state. [0, 1]"""
 
     hue: float = 0
-    """Hue state."""
+    """Hue state. [0, 1]"""
 
     saturation: float = 0
-    """Saturation state."""
+    """Saturation state. [0, 1]"""
 
     temperature: float = 0
-    """Temperature state."""
+    """Temperature state, in Kelvin."""
 
     transition: float = 0
     """Transition time in seconds."""
@@ -298,6 +298,12 @@ class Flickr:
         return Flickr.schema().loads(json)  # type: ignore
 
 
+class FlickrApiInterface:
+    def update_fixture(self, fixture: EngineFixture) -> bool:
+        """Update fixture state in API. Returns true if successful."""
+        raise NotImplementedError("'update_fixture' not yet implemented.")
+
+
 if __name__ == "__main__":
     # Small test
     f = Flickr(