diff --git a/server/src/rewards/definitions/darkness.js b/server/src/rewards/definitions/darkness.js
index eac99030..80b8b75b 100644
--- a/server/src/rewards/definitions/darkness.js
+++ b/server/src/rewards/definitions/darkness.js
@@ -1,5 +1,11 @@
 const DURATION_MS = 15 * 60 * 1000;
 const LIGHT_ENFORCE_TICK_MS = 3000;
+// Rover daemon semantics are inverted:
+// action "on" => IR LED on => nightVisionOn=false
+// action "off" => IR LED off => nightVisionOn=true
+function actionForNightVisionState(nightVisionOn) {
+  return nightVisionOn ? 'off' : 'on';
+}
 
 let activeTimer = null;
 let enforceLightsTimer = null;
@@ -72,7 +78,7 @@ async function stopDarkness(ctx, effect = {}) {
     try {
       ctx.issueCommand(String(roverId), {
         type: 'nightVision',
-        nightVision: { action: wasOn ? 'on' : 'off' },
+        nightVision: { action: actionForNightVisionState(Boolean(wasOn)) },
       });
     } catch (err) {
       ctx.logger.warn('darkness restore nightVision failed', { roverId, error: err.message });
@@ -129,7 +135,7 @@ module.exports = {
       try {
         ctx.issueCommand(String(rover.id), {
           type: 'nightVision',
-          nightVision: { action: 'off' },
+          nightVision: { action: actionForNightVisionState(false) },
         });
       } catch (err) {
         ctx.logger.warn('darkness nightVision off failed', { roverId: rover.id, error: err.message });
diff --git a/server/src/services/homeAssistantService.js b/server/src/services/homeAssistantService.js
index aa33a136..8087826a 100644
--- a/server/src/services/homeAssistantService.js
+++ b/server/src/services/homeAssistantService.js
@@ -27,6 +27,8 @@ const triggerRuntime = new Map(); // triggerId -> { lastFiredAt, lastState, last
 const HA_BUTTON_EVENT_TYPE = 'ha.button.action';
 const LIGHT_IDLE_OFF_MS = 2 * 60 * 1000;
 const DEFAULT_WHITE_KELVIN = 4000;
+// Rover daemon uses inverted semantics: action "on" powers IR LEDs, which means nightVisionOn=false.
+const NIGHT_VISION_DISABLE_ACTION = 'on';
 
 let connection = null;
 let unsubscribeEntities = null;
@@ -206,7 +208,7 @@ function turnOffAllRoverNightVision() {
     try {
       issueCommand(record.id, {
         type: 'nightVision',
-        nightVision: { action: 'off' },
+        nightVision: { action: NIGHT_VISION_DISABLE_ACTION },
       });
     } catch (err) {
       failed += 1;