diff --git a/homeassistant/components/homematic/light.py b/homeassistant/components/homematic/light.py
index c3601461173..41b8165d78e 100644
--- a/homeassistant/components/homematic/light.py
+++ b/homeassistant/components/homematic/light.py
@@ -2,7 +2,7 @@
 import logging
 
 from homeassistant.components.light import (
-    ATTR_BRIGHTNESS, ATTR_EFFECT, ATTR_HS_COLOR, SUPPORT_BRIGHTNESS,
+    ATTR_BRIGHTNESS, ATTR_EFFECT, ATTR_HS_COLOR, ATTR_TRANSITION, SUPPORT_BRIGHTNESS,
     SUPPORT_COLOR, SUPPORT_EFFECT, Light)
 
 from . import ATTR_DISCOVER_DEVICES, HMDevice
@@ -77,6 +77,9 @@ class HMLight(HMDevice, Light):
 
     def turn_on(self, **kwargs):
         """Turn the light on and/or change color or color effect settings."""
+        if ATTR_TRANSITION in kwargs:
+            self._hmdevice.setValue('RAMP_TIME', kwargs[ATTR_TRANSITION])
+        
         if ATTR_BRIGHTNESS in kwargs and self._state == "LEVEL":
             percent_bright = float(kwargs[ATTR_BRIGHTNESS]) / 255
             self._hmdevice.set_level(percent_bright, self._channel)