diff --git a/hueplusplus/HueLight.cpp b/hueplusplus/HueLight.cpp
index c62cb69..73ef334 100755
--- a/hueplusplus/HueLight.cpp
+++ b/hueplusplus/HueLight.cpp
@@ -39,12 +39,17 @@ bool HueLight::Off(uint8_t transition)
 	return OffNoRefresh(transition);
 }
 
-bool HueLight::IsOn()
+bool HueLight::isOn()
 {
 	refreshState();
 	return state["state"]["on"].asBool();
 }
 
+bool HueLight::isOn() const
+{
+	return state["state"]["on"].asBool();
+}
+
 std::string HueLight::getName()
 {
 	refreshState();
diff --git a/hueplusplus/include/HueLight.h b/hueplusplus/include/HueLight.h
index aa00afa..92bc217 100755
--- a/hueplusplus/include/HueLight.h
+++ b/hueplusplus/include/HueLight.h
@@ -116,7 +116,13 @@ public:
 	//! \brief Function to check whether a light is on or off
 	//!
 	//! \return Bool that is true, when the light is on and false, when off
-	bool IsOn();
+	bool isOn();
+
+	//! \brief Const function to check whether a light is on or off
+	//!
+	//! \note This will not refresh the light state
+	//! \return Bool that is true, when the light is on and false, when off
+	bool isOn() const;
 
 	//! \brief Function that returns the name of the light.
 	//!