diff --git a/conf/rpms_and_radar.lua b/conf/rpms_and_radar.lua
index 4337c51..142db56 100644
--- a/conf/rpms_and_radar.lua
+++ b/conf/rpms_and_radar.lua
@@ -58,11 +58,11 @@ while(i <= proxcars and leftsideset == false) do
     i = i + 1
 end
 
-
+rpm_leds = 6
 -- rpm stuff
 if simdata.rpm > 0 and simdata.maxrpm > 0 then
     rpmmargin = .05*simdata.maxrpm;
-    rpminterval = (simdata.maxrpm-rpmmargin) / 6;
+    rpminterval = (simdata.maxrpm-rpmmargin) / rpm_leds;
 
     litleds = 0
     for i = 1,6 do
@@ -72,18 +72,18 @@ if simdata.rpm > 0 and simdata.maxrpm > 0 then
     end
 
     color = GREEN
-    if litleds > 3 and litleds < 6 then
+    if litleds > rpm_leds/2 and litleds < rpm_leds then
         color = YELLOW
     end
-    if litleds >= 6 then
+    if litleds >= rpm_leds then
         color = RED
     end
-    if litleds >=  6 then
+    if litleds >= rpm_leds then
 
         if simdata.mtick % 2 == 0 then
             set_led_range_to_color(1, litleds, color)
         else
-            led_clear_all()
+            led_clear_range(1, rpm_leds)
         end
     else
         set_led_range_to_color(1, litleds, color)
diff --git a/src/monocoque/devices/serial/arduino.c b/src/monocoque/devices/serial/arduino.c
index 765ff74..0d05cc6 100644
--- a/src/monocoque/devices/serial/arduino.c
+++ b/src/monocoque/devices/serial/arduino.c
@@ -313,6 +313,7 @@ int arduino_customled_update(SerialDevice* serialdevice, SimData* simdata)
     lua_register(L, "set_led_to_rgb_color", set_led_to_rgb_color);
     lua_register(L, "set_led_range_to_rgb_color", set_led_range_to_rgb_color);
     lua_register(L, "led_clear_all", led_clear_all);
+    lua_register(L, "led_clear_range", led_clear_all);
 
     lua_pushinteger(L, LUALEDCOLOR_RED);
     lua_setglobal(L, "RED");
diff --git a/src/monocoque/devices/serial/arduinoledlua.c b/src/monocoque/devices/serial/arduinoledlua.c
index 76b7b97..f2082f8 100644
--- a/src/monocoque/devices/serial/arduinoledlua.c
+++ b/src/monocoque/devices/serial/arduinoledlua.c
@@ -340,3 +340,49 @@ int led_clear_all(lua_State *L)
     }
 
 }
+
+int led_clear_range(lua_State *L)
+{
+
+    slogt("lua called c function led_clear_range");
+
+    int range_start = lua_tonumber(L, 1);
+    int range_end = lua_tonumber(L, 2);
+
+    slogd("lua range start is %i", range_start);
+    slogd("lua range end is %i", range_end);
+
+    range_start = range_start - 1;
+
+    lua_getglobal(L, "TotalLeds");
+    int numlights = 0;
+    if (lua_isnumber(L, -1))
+    {
+        numlights = lua_tonumber(L, -1);
+    }
+    slogd("num leds is %i", numlights);
+
+    if(range_end > numlights)
+    {
+        range_end = numlights;
+    }
+
+    if(range_end == 0)
+    {
+        return 1;
+    }
+
+    lua_pushstring(L, "buff");
+    lua_gettable(L, LUA_REGISTRYINDEX);
+    char* bytes = lua_touserdata(L, -1);
+
+    slogt("first byte of buff is x%02x", bytes[0]);
+
+    for( int i = 0; i < numlights; i++)
+    {
+        bytes[(i * 3) + 0] = 0x00;
+        bytes[(i * 3) + 1] = 0x00;
+        bytes[(i * 3) + 2] = 0x00;
+    }
+
+}
diff --git a/src/monocoque/devices/serial/arduinoledlua.h b/src/monocoque/devices/serial/arduinoledlua.h
index 65d027b..99c413a 100644
--- a/src/monocoque/devices/serial/arduinoledlua.h
+++ b/src/monocoque/devices/serial/arduinoledlua.h
@@ -21,5 +21,6 @@ int set_led_to_color(lua_State *L);
 int set_led_range_to_rgb_color(lua_State *L);
 int set_led_to_rgb_color(lua_State *L);
 int led_clear_all(lua_State *L);
+int led_clear_range(lua_State *L);
 
 #endif