If the code hasn't been touched in this long, its probably release-worthy.

src/animations/Power.h

@@ -0,0 +1,54 @@
+#pragma once
+#include <Figments.h>
+
+template<uint8_t MaxBrightness = 255, uint32_t MaxMilliAmps = 500, uint32_t Voltage = 5>
+class Power: public Figment {
+public:
+    Power() : Figment("Power") {}
+
+    void handleEvent(const InputEvent& evt) override {
+        switch (evt.intent) {
+            case InputEvent::PowerToggle:
+              m_powerState = m_powerState.value() <= 128 ? 255 : 0;
+              //Log.info("POWER TOGGLE %d", m_powerState.value());
+              break;
+            case InputEvent::SetPower:
+              m_powerState = evt.asInt() == 0 ? 0 : 255;
+              Log.notice("Power is now %d", m_powerState);
+              break;
+            case InputEvent::SetBrightness:
+              m_brightness = evt.asInt();
+              m_brightness = 255;
+              break;
+            case InputEvent::Beat:
+              m_beatDecay.set(0, 255);
+              break;
+            default:
+              return;
+        }
+    }
+
+    void loop() override {
+        m_powerState.update();
+        m_brightness.update();
+        EVERY_N_MILLISECONDS(20) {
+            m_beatDecay.update(13);
+        }
+    }
+
+    void render(Display* dpy) const override {
+        const uint8_t decayedBrightness = scale8((uint8_t)m_brightness, ease8InOutCubic((uint8_t)m_beatDecay));
+        const uint8_t clippedBrightness = std::min(decayedBrightness, MaxBrightness);
+        const uint8_t scaledBrightness = scale8(m_powerState, clippedBrightness);
+        const uint8_t videoBrightness = brighten8_video(scaledBrightness);
+        const uint8_t powerBrightness = calculate_max_brightness_for_power_mW(videoBrightness, Watts);
+        FastLED.setBrightness(powerBrightness);
+    }
+
+    static constexpr uint32_t Watts = Voltage * MaxMilliAmps;
+
+private:
+    AnimatedNumber m_powerState = 255;
+    AnimatedNumber m_brightness = MaxBrightness;
+    AnimatedNumber m_beatDecay = 255;
+};