diff --git a/src/colors/gamut.ts b/src/colors/gamut.ts
index 50047b5..a501458 100644
--- a/src/colors/gamut.ts
+++ b/src/colors/gamut.ts
@@ -81,7 +81,7 @@ export namespace Gamut {
 
   export function toRGB(x: number, y: number, brightness: number): RGB {
     // Apply gamma correction
-    const Y = brightness;
+    const Y = brightness / 100;
     const X = (Y / y) * x;
     const Z = (Y / y) * (1 - x - y);
 
diff --git a/src/hue/application.ts b/src/hue/application.ts
index c01f0d5..209e494 100644
--- a/src/hue/application.ts
+++ b/src/hue/application.ts
@@ -91,7 +91,7 @@ export class Application {
       body: JSON.stringify(state),
     };
 
-    return this.bridge.rest.get<ClipV2Message<StateChangeSuccess>>(
+    return this.bridge.rest.put<ClipV2Message<StateChangeSuccess>>(
       `/clip/v2/resource/grouped_light/${groupId}`,
       options
     );
@@ -161,7 +161,7 @@ export class Application {
       body: JSON.stringify(state),
     };
 
-    return this.bridge.rest.get<ClipV2Message<Reference>>(`/clip/v2/resource/light/${lightId}`, options);
+    return this.bridge.rest.put<ClipV2Message<Reference>>(`/clip/v2/resource/light/${lightId}`, options);
   }
 
   /** Gets the `motion` resource from the bridge.