diff --git a/.gitignore b/.gitignore
index 19fa632..a674637 100644
--- a/.gitignore
+++ b/.gitignore
@@ -17,3 +17,6 @@ Sessionx.vim
 tags
 # Persistent undo
 [._]*.un~
+
+# OpenOffice temp files
+**/.~*
diff --git a/doc/ESP32 pinout.xcf b/doc/ESP32 pinout.xcf
new file mode 100644
index 0000000..418de6e
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diff --git a/doc/IC connected to I2C on GPIO 17+18.xcf b/doc/IC connected to I2C on GPIO 17+18.xcf
new file mode 100644
index 0000000..910f97f
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diff --git a/doc/RGB_mapping.py b/doc/RGB_mapping.py
new file mode 100644
index 0000000..2b34306
--- /dev/null
+++ b/doc/RGB_mapping.py
@@ -0,0 +1,139 @@
+#!/usr/bin/env python3
+#
+# This script was used to work out how to map the RGB/brightness input
+# data to GPIO pinout voltages.
+
+maxV = 3.27
+
+requirements = [
+    # Input                # Expected output
+    (0, 0, 0, 1.00,        False, None, None, None),
+    (255, 255, 255, 0.00,  False, None, None, None),
+    (255, 0,   0, 0.01,    True, 2.95, maxV, maxV),
+    (255, 0,   0, 1.00,    True, 1.82, 3.27, 3.27),
+    (255, 255, 0, 0.01,    True, 3.04, 2.86, 3.17),
+    (255, 255, 0, 1.00,    True, 2.56, 1.77, 3.15),
+    (255, 255, 255, 0.01,  True, 3.04, 2.86, 3.07),
+    (255, 255, 255, 1.00,  True, 2.56, 1.77, 2.73),
+    (0, 255, 0, 0.01,      True, 3.27, 2.95, 3.27),
+    (0, 255, 0, 1.00,      True, 3.27, 1.82, 3.27),
+    (0, 255, 255, 0.01,    True, 3.13, 2.86, 3.07),
+    (0, 255, 255, 1.00,    True, 2.97, 1.76, 2.71),
+    (0, 0, 255, 0.01,      True, 3.27, 3.27, 2.95),
+    (0, 0, 255, 1.00,      True, 3.27, 3.27, 1.82),
+    (255, 0, 255, 0.01,    True, 2.88, 3.12, 2.86),
+    (255, 0, 255, 1.00,    True, 1.85, 2.92, 1.77),
+    (255, 128, 0, 0.01,    True, 2.86, 2.93, 3.17),
+    (255, 128, 0, 1.00,    True, 1.77, 2.10, 3.15),
+    (255, 0 ,128, 0.01,    True, 2.86, 3.12, 3.10),
+    (255, 0 ,128, 1.00,    True, 1.77, 2.94, 2.84),
+    (255, 128, 128, 0.01,  True, 2.86, 2.93, 3.10),
+    (255, 128, 128, 1.00,  True, 1.77, 2.10, 2.86),
+    (128, 255, 0, 0.01,    True, 3.11, 2.86, 3.17),
+    (128, 255, 0, 1.00,    True, 2.87, 1.76, 3.15),
+    (255, 128, 255, 0.01,  True, 2.86, 2.93, 2.87),
+    (255, 128, 255, 1.00,  True, 1.76, 2.06, 1.80),
+]
+
+def get_red(r, g, b, brightness):
+    if r == 0:
+        if g == 1 and b == 1:
+            return round(3.13 - (brightness * 100 - 1) * (3.13 - 2.97)/99, 2)
+        else:
+            return maxV; 
+    if g == 1:
+        if r == 1:
+            return round((3.04 - (brightness * 100 - 1) * (3.04 - 2.56)/99), 2)
+        elif r > 0:
+            return round((3.11 - (brightness * 100 - 1) * (3.11 - 2.87)/99), 2)
+    elif g > 0:
+        if b == 1:
+            return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.76)/99), 2)
+        else:
+            return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.77)/99), 2)
+    elif b == 1:
+        return round((2.88 - (brightness * 100 - 1) * (2.88 - 1.85)/99), 2)
+    elif b > 0:
+        return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.77)/99), 2)
+    else:
+        return round((2.95 - (brightness * 100 - 1) * (2.95 - 1.82)/99), 2)
+    raise Exception("Shouldn't get here")
+
+def get_green(r, g, b, brightness):
+    if g == 0:
+        if r == 1 and b == 1:
+            return round(3.12 - (brightness * 100 - 1) * (3.12 - 2.92)/99, 2)
+        elif r == 1 and b > 0:
+            return round(3.12 - (brightness * 100 - 1) * (3.12 - 2.94)/99, 2)
+        else:
+            return maxV; 
+    if r == 1 and g == 1:
+        return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.77)/99), 2)
+    elif r == 1:
+        if b == 1:
+            return round((2.93 - (brightness * 100 - 1) * (2.93 - 2.06)/99), 2)
+        else:
+            return round((2.93 - (brightness * 100 - 1) * (2.93 - 2.10)/99), 2)
+    elif r > 0:
+        return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.76)/99), 2)
+    elif r == 0 and b == 1:
+        return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.76)/99), 2)
+    else:
+        return round((2.95 - (brightness * 100 - 1) * (2.95 - 1.82)/99), 2)
+    raise Exception("Shouldn't get here")
+
+def get_blue(r, g, b, brightness):
+    if b == 0:
+        if r > 0 and g > 0:
+            return round((3.17 - (brightness * 100 - 1) * (3.17 - 3.15)/99), 2)
+        else:
+            return maxV; 
+    if r == 1 and g == 1:
+        return round((3.07 - (brightness * 100 - 1) * (3.07 - 2.73)/99), 2)
+    elif r == 1 and g == 0:
+        if b == 1:
+            return round((2.86 - (brightness * 100 - 1) * (2.86 - 1.77)/99), 2)
+        elif b > 0:
+            return round((3.10 - (brightness * 100 - 1) * (3.10 - 2.84)/99), 2)
+    elif r == 1 and g > 0:
+        if b == 1:
+            return round((2.87 - (brightness * 100 - 1) * (2.87 - 1.80)/99), 2)
+        else:
+            return round((3.10 - (brightness * 100 - 1) * (3.10 - 2.86)/99), 2)
+    elif r == 0 and g == 1:
+        return round((3.07 - (brightness * 100 - 1) * (3.07 - 2.71)/99), 2)
+    else:
+        return round((2.95 - (brightness * 100 - 1) * (2.95 - 1.82)/99), 2)
+    raise Exception("Shouldn't get here")
+
+def make_rgb_fractions(r, g, b):
+    """ These ought to be 0 to 1 on input already, but it won't 
+        hurt to make sure they are."""
+    m = max(r, g, b)
+    r = r/m
+    g = g/m
+    b = b/m
+    return (r, g, b)
+
+
+for r,g,b,brightness,stateExpected, rVexpected, gVexpected, bVexpected in requirements:
+    print(f"IN: {r}, {g}, {b} at {brightness} / ", end="")
+    print(f"EXP: ({stateExpected}) {rVexpected},{gVexpected},{bVexpected} ", end="")
+
+    state = True
+    if r + g + b == 0 or brightness == 0:
+        state = False
+        rV = None
+        gV = None
+        bV = None
+    else:
+        r, g, b = make_rgb_fractions(r, g, b)
+        rV = get_red(r, g, b, brightness)
+        gV = get_green(r, g, b, brightness)
+        bV = get_blue(r, g, b, brightness)
+    print(f"OUT: ({state}) {rV},{gV},{bV} ", end="")
+    if rV == rVexpected and gV == gVexpected and bV == bVexpected and state == stateExpected:
+        print(" [PASS]");
+    else:
+        print()
+
diff --git a/doc/Trace bottom right.xcf b/doc/Trace bottom right.xcf
index a0706e5..b49e433 100644
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diff --git a/doc/Trace for IC connected to I2C on GPIO 17+18.xcf b/doc/Trace for IC connected to I2C on GPIO 17+18.xcf
new file mode 100644
index 0000000..9e63b6c
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diff --git a/doc/Trace front panel connector.xcf b/doc/Trace front panel connector.xcf
index 095d2cf..77ea49d 100644
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diff --git a/doc/Trace top right.xcf b/doc/Trace top right.xcf
index de2485c..c28a7c0 100644
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diff --git a/doc/Yeelight GPIO measurements.xlsx b/doc/Yeelight GPIO measurements.xlsx
index a04923c..276d508 100644
Binary files a/doc/Yeelight GPIO measurements.xlsx and b/doc/Yeelight GPIO measurements.xlsx differ
diff --git a/yeelight_bs2.h b/yeelight_bs2.h
index 031f6a5..72b2b31 100644
--- a/yeelight_bs2.h
+++ b/yeelight_bs2.h
@@ -92,11 +92,6 @@ class YeelightBedsideLampV2LightOutput : public Component, public LightOutput
   {
     ESP_LOGD("custom", "Activate RGB %f, %f, %f, BRIGHTNESS %f", red, green, blue, brightness);
 
-    // This tunes the power for the red channel a bit, to bring
-    // the red=1, green=1, blue=1 color more towards white.
-    // (on my lamps, there is a faint hint of red in the color)
-    red = red * 0.93f;
-
     // Compensate for brightness.
     red = red * brightness;
     green = green * brightness;