diff --git a/dump.py b/dump.py
index 19fa7d5..084a045 100755
--- a/dump.py
+++ b/dump.py
@@ -37,6 +37,7 @@ LINES = [
   ('Transmission', ilt.GetTransmissionPercent, '%'),
   ('Optical density', ilt.GetOpticalDensity, '%'),
   ('100% percent setting', ilt.Get100PercentVoltage, 'V'),
+  ('Dark mode', lambda: ilt.DARK_NAMES[ilt.GetDarkMode()], ''),
 ]
 
 
diff --git a/ilt1000.py b/ilt1000.py
index 88b6188..15fa21a 100755
--- a/ilt1000.py
+++ b/ilt1000.py
@@ -57,6 +57,16 @@ class Saturated(Error):
 
 class ILT1000(object):
 
+  DARK_NONE = 0
+  DARK_FACTORY = 1
+  DARK_USER = 2
+
+  DARK_NAMES = {
+    0: 'None',
+    1: 'Factory',
+    2: 'User',
+  }
+
   # ILT1000 presents two FTDI serial devices, which become ttyUSB0 and ttyUSB1
   # if nothing else is attached. ttyUSB0 seems to be completely non-responsive.
   # We default to ttyUSB1
@@ -144,3 +154,6 @@ class ILT1000(object):
     # Spec says microvolts, but actual values appear to be in volts.
     ret = self._SendCommand('get100perc')
     return float(ret)
+
+  def GetDarkMode(self):
+    return int(self._SendCommand('getdarkmode'))