diff --git a/fs/colors.cfg b/fs/colors.cfg
index 7ade66f..0196e87 100644
--- a/fs/colors.cfg
+++ b/fs/colors.cfg
@@ -1,18 +1,18 @@
 [
-	{"name": "off", "red": 0, "green": 0, "blue": 0},
-	{"name": "candle", "red": 30, "green": 15, "blue": 4},
-	{"name": "25w", "red": 35, "green": 15, "blue": 6},
-	{"name": "40w", "red": 50, "green": 25, "blue": 10},
-	{"name": "60w", "red": 70, "green": 45, "blue": 20},
-	{"name": "75w", "red": 80, "green": 70, "blue": 30},
-	{"name": "100w", "red": 100, "green": 85, "blue": 50},
-	{"name": "neon", "red": 100, "green": 95, "blue": 70},
-	{"name": "red", "red": 50, "green": 5, "blue": 5},
-	{"name": "green", "red": 5, "green": 50, "blue": 5},
-	{"name": "blue", "red": 5, "green": 5, "blue": 80},
-	{"name": "yellow", "red": 50, "green": 50, "blue": 5},
-	{"name": "violet", "red": 50, "green": 5, "blue": 80},
-	{"name": "warmWhite", "red": 90, "green": 90, "blue": 30},
-	{"name": "coldWhite", "red": 80, "green": 80, "blue": 100},
-	{"name": "brightWhite", "red": 255, "green": 255, "blue": 255}
+	{"name": "off", "color": "#000"},
+	{"name": "candle", "color": "#201004"},
+	{"name": "25w", "color": "#231006"},
+	{"name": "40w", "color": "#32190e"},
+	{"name": "60w", "color": "#463014"},
+	{"name": "75w", "color": "#504620"},
+	{"name": "100w", "color": "#645542"},
+	{"name": "neon", "color": "#646046"},
+	{"name": "red", "color": "#320505"},
+	{"name": "green", "color": "#053205"},
+	{"name": "blue", "color": "#050550"},
+	{"name": "yellow", "color": "#323205"},
+	{"name": "violet", "color": "#320550"},
+	{"name": "warmWhite", "color": "#5a5a1e"},
+	{"name": "coldWhite", "color": "#505064"},
+	{"name": "brightWhite", "color": "#ffffff"}
 ]
diff --git a/fs/init.js b/fs/init.js
index 0991a38..83f5e7f 100644
--- a/fs/init.js
+++ b/fs/init.js
@@ -97,6 +97,54 @@ function allLedOff() {
   NeoPixel_show();
 }
 
+function validateColor(color) {
+  if (color.name.length === 0) {
+    print('ERROR: Color name missing!');
+    return false;
+  }
+  if ((color.color.length !== 4 && color.color.length !== 7) || color.color[0] !== '#') {
+    print('ERROR: Color', color.name, 'has an invalid color definition.');
+    print('   Is:', color.color, ' but should #rgb where r/g/b is a 1-digit hex number in the range of 0..9a..f or #RGB where R/G/B is a 2-digit hex number');
+    return false;
+  }
+  for (let i=0; i<color.color.length; ++i) {
+    if (color.color[i] < '0' || (color.color[i] > '9' && (color.color[i] < 'a' || color.color[i] > 'f'))) {
+      print('ERROR: Color', color.name, 'has an invalid color definition.');
+      print('   Is:', color.color, ' but should #rgb where r/g/b is a 1-digit hex number in the range of 0..9a..f or #RGB where R/G/B is a 2-digit hex number');
+      return false;
+    }
+  }
+  return true;
+}
+
+function hexToDec(digit) {
+  if (digit >= 'a') return digit - 'a';
+  else if (digit >= 'A') return digit - 'A';
+  else return digit - '0';
+}
+
+function getRedOfColorString(color) {
+  if (color.length === 4) {
+    return hexToDec(color.color[1]);
+  } else {
+    return hexToDec(color.color[1]) * 16 + hexToDec(color.color[2]);
+  }
+}
+function getGreenOfColorString(color) {
+  if (color.length === 4) {
+    return hexToDec(color.color[2]);
+  } else {
+    return hexToDec(color.color[3]) * 16 + hexToDec(color.color[4]);
+  }
+}
+function getBlueOfColorString(color) {
+  if (color.length === 4) {
+    return hexToDec(color.color[3]);
+  } else {
+    return hexToDec(color.color[5]) * 16 + hexToDec(color.color[6]);
+  }
+}
+
 function loadColorDefs() {
   // Load Color definitions
   let json = File.read(colorFile);
@@ -109,7 +157,10 @@ function loadColorDefs() {
     colors = JSON.parse(json);
   }
   for (i=0; i<colors.length; ++i) {
-    print('- addColor', colors[i].name, colors[i].red, colors[i].green, colors[i].blue);
+    print('- addColor', colors[i].name, colors[i].color);
+    colors[i].red = getRedOfColorString(colors[i]);
+    colors[i].green = getGreenOfColorString(colors[i]);
+    colors[i].blue = getBlueOfColorString(colors[i]);
     addColor(colors[i].name, colors[i].red, colors[i].green, colors[i].blue);
   }
   json = null;
@@ -327,11 +378,11 @@ function recoverFile(filename) {
 }
 print('     led.putColors');
 RPC.addHandler('led.putColors', function(args) {
-  if (args !== undefined && args.colors !== undefined) {
+  if (args !== undefined && args.colors !== undefined && args.colors[0] !== undefined && args.colors[0].name !== undefined && args.colors[0].color !== undefined) {
     saveFile(colorFile, args.colors);
     return { result: 'ok' };
   } else {
-    return { error: 'colors: {name, red, green, blue} is required' };
+    return { error: 'colors: {name, color} is required' };
   }
 }, null);
 print('     led.putLamps');