diff --git a/src/Fader.cpp b/src/Fader.cpp
index e865fee..a9db117 100644
--- a/src/Fader.cpp
+++ b/src/Fader.cpp
@@ -1,31 +1,39 @@
 #include "Fader.h"
 
-Fader::Fader(std::size_t nmodules, uint8_t fadestep)
-	: m_fadestep(fadestep),
-	  m_curColor(nmodules),
-	  m_targetColor(nmodules)
+Fader::Fader(std::size_t nstrips, std::size_t nmodules_per_strip, uint8_t fadestep)
+	: m_strips(nstrips),
+	  m_modulesPerStrip(nmodules_per_strip),
+	  m_fadestep(fadestep),
+	  m_curColor(nstrips * nmodules_per_strip),
+	  m_targetColor(nstrips * nmodules_per_strip)
 {}
 
-void Fader::set_color(uint32_t module, const Fader::Color &color)
+void Fader::set_color(uint32_t strip, uint32_t module, const Fader::Color &color)
 {
-	m_targetColor[module] = m_curColor[module] = color;
+	uint32_t idx = make_module_idx(strip, module);
+
+	m_targetColor[idx] = m_curColor[idx] = color;
 
 	m_somethingChanged = true;
 }
 
-void Fader::add_color(uint32_t module, const Fader::Color &color)
+void Fader::add_color(uint32_t strip, uint32_t module, const Fader::Color &color)
 {
-	m_curColor[module] += color;
-	m_curColor[module].normalize();
-	m_targetColor[module] += color;
-	m_targetColor[module].normalize();
+	uint32_t idx = make_module_idx(strip, module);
+
+	m_curColor[idx] += color;
+	m_curColor[idx].normalize();
+	m_targetColor[idx] += color;
+	m_targetColor[idx].normalize();
 
 	m_somethingChanged = true;
 }
 
-void Fader::fade_color(uint32_t module, const Fader::Color &color)
+void Fader::fade_color(uint32_t strip, uint32_t module, const Fader::Color &color)
 {
-	m_targetColor[module] = color;
+	uint32_t idx = make_module_idx(strip, module);
+
+	m_targetColor[idx] = color;
 
 	m_somethingChanged = true;
 }
diff --git a/src/Fader.h b/src/Fader.h
index 3892bf0..4a42222 100644
--- a/src/Fader.h
+++ b/src/Fader.h
@@ -28,11 +28,11 @@ class Fader
         };
 
 
-        Fader(std::size_t nmodules, uint8_t fadestep = 1);
+        Fader(std::size_t nstrips, std::size_t nmodules_per_strip, uint8_t fadestep = 1);
 
-        void set_color(uint32_t module, const Color &color);
-        void fade_color(uint32_t module, const Color &color);
-        void add_color(uint32_t module, const Color &color);
+        void set_color(uint32_t strip, uint32_t module, const Color &color);
+        void fade_color(uint32_t strip, uint32_t module, const Color &color);
+        void add_color(uint32_t strip, uint32_t module, const Color &color);
         void set_color(const Color &color); // for all LEDs
         void fade_color(const Color &color); // for all LEDs
         void add_color(const Color &color); // for all LEDs
@@ -50,6 +50,9 @@ class Fader
             return m_curColor;
         }
 
+        std::size_t modules_per_strip(void) { return m_modulesPerStrip; }
+        std::size_t strips(void) { return m_strips; }
+
     private:
         /*!
          * Fade the colour value in cur towards target.
@@ -60,6 +63,13 @@ class Fader
          */
         bool update_fade(int16_t *cur, const int16_t *target);
 
+        inline uint32_t make_module_idx(uint32_t strip, uint32_t module)
+        {
+            return strip * m_modulesPerStrip + module;
+        }
+
+        std::size_t m_strips;
+        std::size_t m_modulesPerStrip;
         uint8_t m_fadestep;
         bool m_somethingChanged;
 
diff --git a/src/main.cpp b/src/main.cpp
index 7cddb0d..bc2a97e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -12,10 +12,11 @@
 #include <esp32_digital_led_funcs.h>
 
 const uint32_t FRAME_INTERVAL_US = 16666;
-const uint32_t NUM_LEDS = 138;
+const uint32_t NUM_STRIPS = 2;
+const uint32_t NUM_LEDS = 69;
 
 std::array<strand_t, 1> STRANDS { // Avoid using any of the strapping pins on the ESP32, anything >=32, 16, 17... not much left.
-  strand_t {.rmtChannel = 0, .gpioNum = 4, .ledType = LED_SK6812W_V1, .brightLimit = 32, .numPixels = NUM_LEDS},
+  strand_t {.rmtChannel = 0, .gpioNum = 4, .ledType = LED_SK6812W_V1, .brightLimit = 32, .numPixels = NUM_LEDS * NUM_STRIPS},
 };
 
 bool led_on = false;