diff --git a/CLAUDE.md b/CLAUDE.md
index b6be638..e2c5422 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -90,7 +90,7 @@ Commands arrive as newline-terminated ASCII lines. Each `parse*` function in `pr
 | `HOME` | `HOME <id>` / `HOMEALL` | Run homing sequence |
 | `SWEEP` | `SWEEP <id> <accel> <speed>` | Start sweep (0/0 stops) |
 | `POS?` | `POS?` | Query all gauges: `POS <id> <cur> <tgt> <homed> <homingState> <sweep>` |
-| `LED` | `LED <id> <idx> <r> <g> <b>` | Set one LED (0-based index within gauge segment) to RGB colour (0–255 each) |
+| `LED` | `LED <id> <idx> <r> <g> <b>` | Set one LED (0-based index within gauge segment) to RGB colour (0–255 each); `<idx>` may be a range `N-M` to set LEDs N through M in one command |
 | `LED?` | `LED?` | Query all LEDs: one `LED <id> <idx> <r> <g> <b>` line per LED, then `OK` |
 | `PING` | `PING` | Responds `PONG` |
 
diff --git a/Gaugecontroller/Gaugecontroller.ino b/Gaugecontroller/Gaugecontroller.ino
index 55b6407..139c3aa 100644
--- a/Gaugecontroller/Gaugecontroller.ino
+++ b/Gaugecontroller/Gaugecontroller.ino
@@ -520,13 +520,19 @@ bool parseLedQuery(const String& line) {
 }
 
 bool parseLed(const String& line) {
-  int id, idx, r, g, b;
-  if (sscanf(line.c_str(), "LED %d %d %d %d %d", &id, &idx, &r, &g, &b) == 5) {
+  int id, r, g, b;
+  char idxToken[16];
+  if (sscanf(line.c_str(), "LED %d %15s %d %d %d", &id, idxToken, &r, &g, &b) == 5) {
     if (id < 0 || id >= GAUGE_COUNT) { sendReply("ERR BAD_ID"); return true; }
-    if (idx < 0 || idx >= gaugePins[id].ledCount) { sendReply("ERR BAD_IDX"); return true; }
-    leds[gaugeLedOffset[id] + idx] = CRGB(constrain(r, 0, 255),
-                                          constrain(g, 0, 255),
-                                          constrain(b, 0, 255));
+    char* dash = strchr(idxToken, '-');
+    int idxFirst = atoi(idxToken);
+    int idxLast  = dash ? atoi(dash + 1) : idxFirst;
+    if (idxFirst < 0 || idxLast >= gaugePins[id].ledCount || idxFirst > idxLast) {
+      sendReply("ERR BAD_IDX"); return true;
+    }
+    CRGB color(constrain(r, 0, 255), constrain(g, 0, 255), constrain(b, 0, 255));
+    for (int i = idxFirst; i <= idxLast; i++)
+      leds[gaugeLedOffset[id] + i] = color;
     FastLED.show();
     sendReply("OK");
     return true;