diff --git a/Kelvin2RGB.cpp b/Kelvin2RGB.cpp
index 0c0ad46..681290f 100644
--- a/Kelvin2RGB.cpp
+++ b/Kelvin2RGB.cpp
@@ -1,7 +1,7 @@
 //
 //    FILE: Kelvin2RGB.cpp
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.3
+// VERSION: 0.1.4
 //    DATE: 2018-01-31
 // PURPOSE: Arduino library for converting temperature to RGB values
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
@@ -12,6 +12,8 @@
 //  0.1.2    2021-06-01  add RGB565() - 16 bit colour - output
 //  0.1.3    2021-11-06  update build-CI, badges
 //                       add setRGB(), CMYK(), BGR(), reset();
+//  0.1.4    2021-12-20  update library.json, license, minor edits
+
 
 #include "Kelvin2RGB.h"
 
@@ -168,3 +170,4 @@ void Kelvin2RGB::_normalize()
 
 
 // -- END OF FILE --
+
diff --git a/Kelvin2RGB.h b/Kelvin2RGB.h
index 6d3c478..a26a7da 100644
--- a/Kelvin2RGB.h
+++ b/Kelvin2RGB.h
@@ -2,14 +2,14 @@
 //
 //    FILE: Kelvin2RGB.h
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.3
+// VERSION: 0.1.4
 //    DATE: 2018-01-31
 // PURPOSE: Arduino library for converting temperature to RGB values
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
 //
 
 
-#define KELVIN2RGB_LIB_VERSION            (F("0.1.3"))
+#define KELVIN2RGB_LIB_VERSION            (F("0.1.4"))
 
 #include "Arduino.h"
 
diff --git a/LICENSE b/LICENSE
index 0feff1d..2ede7a7 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018-2021 Rob Tillaart
+Copyright (c) 2018-2022 Rob Tillaart
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
diff --git a/README.md b/README.md
index d7f399b..0d18fb9 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 # Kelvin2RGB
 
-Arduino library for converting temperature and brightness to RGB values
+Arduino library for converting temperature and brightness to RGB values.
 
 
 ## Credentials
@@ -27,7 +27,7 @@ however these are not investigated. On request these can be added.
 
 The library converts a temperature in Kelvin and a brightness (0..100%) 
  to 3 numbers red, green and blue.
-These numbers are weights can be used to correct a colorimage for virtual white temperature.
+These numbers are weights can be used to correct a colour image for virtual white temperature.
 
 There are 2 convert functions where the **convert_NB()** is claimed to be 
 the more accurate one.
diff --git a/examples/Kelvin2RGB565_diff_hex/Kelvin2RGB565_diff_hex.ino b/examples/Kelvin2RGB565_diff_hex/Kelvin2RGB565_diff_hex.ino
index 468a54c..45296bf 100644
--- a/examples/Kelvin2RGB565_diff_hex/Kelvin2RGB565_diff_hex.ino
+++ b/examples/Kelvin2RGB565_diff_hex/Kelvin2RGB565_diff_hex.ino
@@ -1,12 +1,10 @@
 //
 //    FILE: Kelvin2RGB565_diff_hex.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.2
 // PURPOSE: demo - shows difference between 2 convert functions for the 565 16 bit coding
 //    DATE: 2021-06-01
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
 //
-
 // shows difference between the two calculations
 
 
@@ -23,7 +21,7 @@ void setup()
 
   KRGB.begin();
   KRGB2.begin();
-  
+
   test_difference();
 }
 
diff --git a/examples/Kelvin2RGB_diff_hex/Kelvin2RGB_diff_hex.ino b/examples/Kelvin2RGB_diff_hex/Kelvin2RGB_diff_hex.ino
index 9da850c..538273e 100644
--- a/examples/Kelvin2RGB_diff_hex/Kelvin2RGB_diff_hex.ino
+++ b/examples/Kelvin2RGB_diff_hex/Kelvin2RGB_diff_hex.ino
@@ -1,13 +1,10 @@
 //
 //    FILE: Kelvin2RGB_diff_hex.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.2
 // PURPOSE: demo - shows difference between 2 convert functions for the 565 16 bit coding
 //    DATE: 2021-06-01
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
 //
-
-// shows difference between the two calculations
 //       best viewed in plotter.
 
 
@@ -24,7 +21,7 @@ void setup()
 
   KRGB.begin();
   KRGB2.begin();
-  
+
   test_difference();
 }
 
diff --git a/examples/Kelvin2RGB_difference/Kelvin2RGB_difference.ino b/examples/Kelvin2RGB_difference/Kelvin2RGB_difference.ino
index ed01f64..5fbd190 100644
--- a/examples/Kelvin2RGB_difference/Kelvin2RGB_difference.ino
+++ b/examples/Kelvin2RGB_difference/Kelvin2RGB_difference.ino
@@ -1,13 +1,10 @@
 //
 //    FILE: Kelvin2RGB_difference.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 // PURPOSE: demo - shows difference between 2 convert functions.
 //    DATE: 2020-07-29
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
 //
-
-// shows difference between the two calculations
 //       best viewed in plotter.
 
 
@@ -24,7 +21,7 @@ void setup()
 
   KRGB.begin();
   KRGB2.begin();
-  
+
   test_difference();
 }
 
diff --git a/examples/Kelvin2RGB_table/Kelvin2RGB_table.ino b/examples/Kelvin2RGB_table/Kelvin2RGB_table.ino
index 86c8f12..24b5ff0 100644
--- a/examples/Kelvin2RGB_table/Kelvin2RGB_table.ino
+++ b/examples/Kelvin2RGB_table/Kelvin2RGB_table.ino
@@ -1,11 +1,9 @@
 //
 //    FILE: Kelvin2RGB_table.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.0
 // PURPOSE: generate table of values
 //    DATE: 2020-07-29
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
-//
 
 
 #include "Kelvin2RGB.h"
@@ -62,3 +60,4 @@ void test()
 
 
 // -- END OF FILE --
+
diff --git a/examples/Kelvin2RGB_timing/Kelvin2RGB_timing.ino b/examples/Kelvin2RGB_timing/Kelvin2RGB_timing.ino
index 9be3e45..d428fd8 100644
--- a/examples/Kelvin2RGB_timing/Kelvin2RGB_timing.ino
+++ b/examples/Kelvin2RGB_timing/Kelvin2RGB_timing.ino
@@ -1,11 +1,9 @@
 //
 //    FILE: Kelvin2RGB_timing.ino
 //  AUTHOR: Rob Tillaart
-// VERSION: 0.1.1
 // PURPOSE: demo - shows timing 2 methods
 //    DATE: 2020-07-29
 //     URL: https://github.com/RobTillaart/Kelvin2RGB
-//
 
 
 #include "Kelvin2RGB.h"
@@ -23,7 +21,7 @@ void setup()
   KRGB.begin();
 
   test_timing();
-  
+
   Serial.println("\ndone...");
 }
 
diff --git a/library.json b/library.json
index d07f54d..b251737 100644
--- a/library.json
+++ b/library.json
@@ -1,6 +1,6 @@
 {
   "name": "Kelvin2RGB",
-  "keywords": " ",
+  "keywords": "RGB,BGR,RGB565,CMYK,temperature",
   "description": "Arduino library for converting temperature to RGB values",
   "authors":
   [
@@ -15,7 +15,7 @@
     "type": "git",
     "url": "https://github.com/RobTillaart/Kelvin2RGB.git"
   },
-  "version": "0.1.3",
+  "version": "0.1.4",
   "license": "MIT",
   "frameworks": "*",
   "platforms": "*",
diff --git a/library.properties b/library.properties
index c4a5f11..acfb165 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=Kelvin2RGB
-version=0.1.3
+version=0.1.4
 author=Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Rob Tillaart <rob.tillaart@gmail.com>
 sentence=Arduino library for converting temperature to RGB values
diff --git a/test/unit_test_001.cpp b/test/unit_test_001.cpp
index fcfbd8a..5dc68e7 100644
--- a/test/unit_test_001.cpp
+++ b/test/unit_test_001.cpp
@@ -38,6 +38,7 @@
 
 unittest_setup()
 {
+  fprintf(stderr, "KELVIN2RGB_LIB_VERSION: %s\n", (char *) KELVIN2RGB_LIB_VERSION);
 }
 
 
@@ -52,7 +53,7 @@ unittest(test_new_operator)
   assertEqualINF(exp(800));
   assertEqualINF(0.0/0.0);
   assertEqualINF(42);
-  
+
   assertEqualNAN(INFINITY - INFINITY);
   assertEqualNAN(0.0/0.0);
   assertEqualNAN(42);
@@ -60,10 +61,38 @@ unittest(test_new_operator)
 */
 
 
+unittest(test_constants)
+{
+  assertEqual(DLS_dark           ,     0);
+  assertEqual(DLS_match          ,  1700);
+  assertEqual(DLS_sodiumLamp     ,  1700);
+  assertEqual(DLS_candleFlame    ,  1850);
+  assertEqual(DLS_sunrise        ,  1850);
+  assertEqual(DLS_sunset         ,  1850);
+  assertEqual(DLS_bulb           ,  2400);
+  assertEqual(DLS_bulbSoftWhite  ,  2550);
+  assertEqual(DLS_LEDlamp        ,  2700);
+  assertEqual(DLS_warmWhite      ,  3000);
+  assertEqual(DLS_studioLight    ,  3200);
+  assertEqual(DLS_studioCPlight  ,  3350);
+  assertEqual(DLS_daylightHorizon,  5000);
+  assertEqual(DLS_flashLight     ,  5700);
+  assertEqual(DLS_xenonLight     ,  6200);
+  assertEqual(DLS_dayLightBright ,  6500);
+  assertEqual(DLS_normal         ,  6500);
+  assertEqual(DLS_screenlow      ,  6500);
+  assertEqual(DLS_screenMed      ,  8000);
+  assertEqual(DLS_screenHigh     ,  9500);
+  assertEqual(DLS_polewardSky0   , 15000);
+  assertEqual(DLS_polewardSky1   , 19000);
+  assertEqual(DLS_polewardSky2   , 23000);
+  assertEqual(DLS_polewardSky3   , 27000);
+}
+
+
+
 unittest(test_constructor)
 {
-  fprintf(stderr, "VERSION: %s\n", (char *) KELVIN2RGB_LIB_VERSION);
-  
   Kelvin2RGB tempColor;
 
   assertEqualFloat(0, tempColor.temperature(), 0.0001);
@@ -113,7 +142,7 @@ unittest(test_colour_spaces)
 
   fprintf(stderr, "test_colour_spaces\n");
   tempColor.setRGB(0.50, 1.00, 0.75, 90);  // brightness in %
-  
+
   fprintf(stderr, "BRIGHT: %f\n", tempColor.brightness());
   fprintf(stderr, "RED   : %f\n", tempColor.red());
   fprintf(stderr, "GREEN : %f\n", tempColor.green());