diff --git a/src/app.cpp b/src/app.cpp
index d3fba12a..088454f6 100644
--- a/src/app.cpp
+++ b/src/app.cpp
@@ -69,7 +69,7 @@ void app::setup() {
         mPayload.addAlarmListener(std::bind(&PubMqttType::alarmEventListener, &mMqtt, std::placeholders::_1, std::placeholders::_2, std::placeholders::_3));
     }
     #endif
-    setupLed();
+    setupLed(mConfig->led.led_high_active);
 
     mWeb.setup(this, &mSys, mConfig);
     mWeb.setProtection(strlen(mConfig->sys.adminPwd) != 0);
@@ -353,7 +353,7 @@ void app::tickSend(void) {
     }
     yield();
 
-    updateLed();
+    updateLed(mConfig->led.led_high_active);
 }
 
 //-----------------------------------------------------------------------------
@@ -386,31 +386,33 @@ void app::mqttSubRxCb(JsonObject obj) {
 }
 
 //-----------------------------------------------------------------------------
-void app::setupLed(void) {
-    /** LED connection diagram
-     *          \\
-     * PIN ---- |<----- 3.3V
-     *
-     * */
+void app::setupLed(uint8_t is_high_active) {
+
+    uint8_t led_off = (is_high_active != 0) ? LOW : HIGH;
+
     if (mConfig->led.led0 != 0xff) {
         pinMode(mConfig->led.led0, OUTPUT);
-        digitalWrite(mConfig->led.led0, HIGH);  // LED off
+        digitalWrite(mConfig->led.led0, led_off);
     }
     if (mConfig->led.led1 != 0xff) {
         pinMode(mConfig->led.led1, OUTPUT);
-        digitalWrite(mConfig->led.led1, HIGH);  // LED off
+        digitalWrite(mConfig->led.led1, led_off);
     }
 }
 
 //-----------------------------------------------------------------------------
-void app::updateLed(void) {
+void app::updateLed(uint8_t is_high_active) {
+
+    uint8_t led_off = (is_high_active != 0) ? LOW : HIGH;
+    uint8_t led_on = (is_high_active != 0) ? HIGH : LOW;
+
     if (mConfig->led.led0 != 0xff) {
         Inverter<> *iv = mSys.getInverterByPos(0);
         if (NULL != iv) {
             if (iv->isProducing(mTimestamp))
-                digitalWrite(mConfig->led.led0, LOW);  // LED on
+                digitalWrite(mConfig->led.led0, led_on);
             else
-                digitalWrite(mConfig->led.led0, HIGH);  // LED off
+                digitalWrite(mConfig->led.led0, led_off);
         }
     }
 }
diff --git a/src/app.h b/src/app.h
index cbf7e6a1..252434ae 100644
--- a/src/app.h
+++ b/src/app.h
@@ -213,8 +213,8 @@ class app : public IApp, public ah::Scheduler {
 
         void mqttSubRxCb(JsonObject obj);
 
-        void setupLed(void);
-        void updateLed(void);
+        void setupLed(uint8_t is_high_active);
+        void updateLed(uint8_t is_high_active);
 
         void tickReboot(void) {
             DPRINTLN(DBG_INFO, F("Rebooting..."));
diff --git a/src/config/settings.h b/src/config/settings.h
index 6d58b406..7449a0b6 100644
--- a/src/config/settings.h
+++ b/src/config/settings.h
@@ -100,6 +100,7 @@ typedef struct {
 typedef struct {
     uint8_t led0;  // first LED pin
     uint8_t led1;  // second LED pin
+    uint8_t led_high_active;  // determines if LEDs are high or low active
 } cfgLed_t;
 
 typedef struct {
@@ -378,6 +379,7 @@ class settings {
 
             mCfg.led.led0 = DEF_PIN_OFF;
             mCfg.led.led1 = DEF_PIN_OFF;
+            mCfg.led.led_high_active = LOW;
 
             memset(&mCfg.inst, 0, sizeof(cfgInst_t));
 
@@ -517,9 +519,11 @@ class settings {
             if(set) {
                 obj[F("0")] = mCfg.led.led0;
                 obj[F("1")] = mCfg.led.led1;
+                obj[F("2")] = mCfg.led.led_high_active;
             } else {
                 mCfg.led.led0 = obj[F("0")];
                 mCfg.led.led1 = obj[F("1")];
+                mCfg.led.led_high_active = obj[F("2")];
             }
         }
 
diff --git a/src/web/RestApi.h b/src/web/RestApi.h
index b224f239..8c193e28 100644
--- a/src/web/RestApi.h
+++ b/src/web/RestApi.h
@@ -391,6 +391,7 @@ class RestApi {
             obj[F("miso")] = mConfig->nrf.pinMiso;
             obj[F("led0")] = mConfig->led.led0;
             obj[F("led1")] = mConfig->led.led1;
+            obj[F("led_high_active")] = mConfig->led.led_high_active;
         }
 
         void getRadio(JsonObject obj) {
diff --git a/src/web/html/setup.html b/src/web/html/setup.html
index bfbda402..fbe29010 100644
--- a/src/web/html/setup.html
+++ b/src/web/html/setup.html
@@ -411,6 +411,10 @@
                 [47, "GPIO47"],
                 [48, "GPIO48"],
             ];
+            var led_high_active = [
+                [0, "low active"],
+                [1, "high active"],
+            ];
 
             const re = /11[2,4,6]1.*/;
 
@@ -670,6 +674,14 @@
                         ])
                     );
                 }
+                e.append(
+                    ml("div", { class: "row mb-3" }, [
+                        ml("div", { class: "col-12 col-sm-3 my-2" }, "LED polarity"),
+                        ml("div", { class: "col-12 col-sm-9" },
+                            sel('pinLedHighActive', led_high_active, obj["led_high_active"])
+                        )
+                    ])
+                );
             }
 
             function parseRadio(obj) {
diff --git a/src/web/web.h b/src/web/web.h
index c141e013..94f6ece7 100644
--- a/src/web/web.h
+++ b/src/web/web.h
@@ -33,7 +33,7 @@
 
 #define WEB_SERIAL_BUF_SIZE 2048
 
-const char *const pinArgNames[] = {"pinCs", "pinCe", "pinIrq", "pinSclk", "pinMosi", "pinMiso", "pinLed0", "pinLed1"};
+const char *const pinArgNames[] = {"pinCs", "pinCe", "pinIrq", "pinSclk", "pinMosi", "pinMiso", "pinLed0", "pinLed1", "pinLedHighActive"};
 
 template <class HMSYSTEM>
 class Web {
@@ -532,6 +532,7 @@ class Web {
                     case 5:  mConfig->nrf.pinMiso  = ((pin != 0xff) ? pin : DEF_MISO_PIN); break;
                     case 6:  mConfig->led.led0 = pin; break;
                     case 7:  mConfig->led.led1 = pin; break;
+                    case 8:  mConfig->led.led_high_active = pin; break;  // this is not really a pin but a polarity, but handling it close to here makes sense
                 }
             }