...........................

components/custom_monochromatic/monochromatic_light_output.h

@@ -27,7 +27,7 @@ public:
     return traits;
   }
   void write_state(light::LightState *state) override {
-    if (this->state_ == Off) {
+    if (this->state_ == On) {
       this->light_state_ = state;
       state->current_values_as_brightness(&(this->bright_));
       this->upper_->set_level(this->bright_);