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diff --git a/src/ipa/raspberrypi/controller/rpi/lux.hpp b/src/ipa/raspberrypi/controller/rpi/lux.hpp
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+++ b/src/ipa/raspberrypi/controller/rpi/lux.hpp
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+/* SPDX-License-Identifier: BSD-2-Clause */
+/*
+ * Copyright (C) 2019, Raspberry Pi (Trading) Limited
+ *
+ * lux.hpp - Lux control algorithm
+ */
+#pragma once
+
+#include <atomic>
+#include <mutex>
+
+#include "../lux_status.h"
+#include "../algorithm.hpp"
+
+// This is our implementation of the "lux control algorithm".
+
+namespace RPi {
+
+class Lux : public Algorithm
+{
+public:
+	Lux(Controller *controller);
+	char const *Name() const override;
+	void Read(boost::property_tree::ptree const &params) override;
+	void Prepare(Metadata *image_metadata) override;
+	void Process(StatisticsPtr &stats, Metadata *image_metadata) override;
+	void SetCurrentAperture(double aperture);
+
+private:
+	// These values define the conditions of the reference image, against
+	// which we compare the new image.
+	double reference_shutter_speed_; // in micro-seconds
+	double reference_gain_;
+	double reference_aperture_; // units of 1/f
+	double reference_Y_; // out of 65536
+	double reference_lux_;
+	std::atomic<double> current_aperture_;
+	LuxStatus status_;
+	std::mutex mutex_;
+};
+
+} // namespace RPi