diff --git a/src/systems/isq/CMakeLists.txt b/src/systems/isq/CMakeLists.txt
index c7dffcfc..bb575c65 100644
--- a/src/systems/isq/CMakeLists.txt
+++ b/src/systems/isq/CMakeLists.txt
@@ -49,6 +49,7 @@ add_units_module(
             include/units/isq/dimensions/inductance.h
             include/units/isq/dimensions/length.h
             include/units/isq/dimensions/luminance.h
+            include/units/isq/dimensions/luminous_flux.h
             include/units/isq/dimensions/luminous_intensity.h
             include/units/isq/dimensions/magnetic_flux.h
             include/units/isq/dimensions/magnetic_induction.h
diff --git a/src/systems/isq/include/units/isq/dimensions.h b/src/systems/isq/include/units/isq/dimensions.h
index a4e8dd1d..4983390c 100644
--- a/src/systems/isq/include/units/isq/dimensions.h
+++ b/src/systems/isq/include/units/isq/dimensions.h
@@ -48,6 +48,7 @@
 #include <units/isq/dimensions/inductance.h>
 #include <units/isq/dimensions/length.h>
 #include <units/isq/dimensions/luminance.h>
+#include <units/isq/dimensions/luminous_flux.h>
 #include <units/isq/dimensions/luminous_intensity.h>
 #include <units/isq/dimensions/magnetic_flux.h>
 #include <units/isq/dimensions/magnetic_induction.h>
diff --git a/src/systems/isq/include/units/isq/dimensions/luminous_flux.h b/src/systems/isq/include/units/isq/dimensions/luminous_flux.h
new file mode 100644
index 00000000..a86a6285
--- /dev/null
+++ b/src/systems/isq/include/units/isq/dimensions/luminous_flux.h
@@ -0,0 +1,36 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+#include <units/concepts.h>
+#include <units/isq/dimensions/power.h>
+
+namespace units::isq {
+
+template<typename Child, Unit U, typename... Dims>
+using dim_luminous_flux = dim_power<Child, U, Dims...>;
+
+template<typename T>
+concept LuminousFlux = QuantityOfT<T, dim_luminous_flux>;
+
+}  // namespace units::isq
diff --git a/src/systems/si/CMakeLists.txt b/src/systems/si/CMakeLists.txt
index f591c780..052d6d3c 100644
--- a/src/systems/si/CMakeLists.txt
+++ b/src/systems/si/CMakeLists.txt
@@ -50,6 +50,7 @@ add_units_module(
             include/units/isq/si/inductance.h
             include/units/isq/si/length.h
             include/units/isq/si/luminance.h
+            include/units/isq/si/luminous_flux.h
             include/units/isq/si/luminous_intensity.h
             include/units/isq/si/magnetic_flux.h
             include/units/isq/si/magnetic_induction.h
diff --git a/src/systems/si/include/units/isq/si/luminous_flux.h b/src/systems/si/include/units/isq/si/luminous_flux.h
new file mode 100644
index 00000000..7d9592e3
--- /dev/null
+++ b/src/systems/si/include/units/isq/si/luminous_flux.h
@@ -0,0 +1,89 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2018 Mateusz Pusz
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#pragma once
+
+// IWYU pragma: begin_exports
+#include <units/isq/si/power.h>
+#include <units/quantity.h>
+#include <units/reference.h>
+#include <units/symbol_text.h>
+// IWYU pragma: end_exports
+
+#include <units/isq/si/prefixes.h>
+#include <units/unit.h>
+
+namespace units::isq::si {
+
+// TODO Is this correct? Should we account for steradian here? How?
+
+struct lumen : named_scaled_unit<lumen, "lm", ratio(1, 683), watt> {};
+
+using dim_luminous_flux = dim_power;
+
+template<UnitOf<dim_luminous_flux> U, Representation Rep = double>
+using luminous_flux = power<U, Rep>;
+
+#ifndef UNITS_NO_LITERALS
+
+inline namespace literals {
+
+// lm
+constexpr auto operator"" _q_lm(unsigned long long l)
+{
+  gsl_ExpectsAudit(std::in_range<std::int64_t>(l));
+  return luminous_flux<lumen, std::int64_t>(static_cast<std::int64_t>(l));
+}
+constexpr auto operator"" _q_lm(long double l) { return luminous_flux<lumen, long double>(l); }
+
+}  // namespace literals
+
+#endif  // UNITS_NO_LITERALS
+
+#ifndef UNITS_NO_REFERENCES
+
+namespace luminous_flux_references {
+
+inline constexpr auto lm = reference<dim_luminous_flux, lumen>{};
+
+}  // namespace luminous_flux_references
+
+namespace references {
+
+using namespace luminous_flux_references;
+
+}  // namespace references
+
+#endif  // UNITS_NO_REFERENCES
+
+}  // namespace units::isq::si
+
+#ifndef UNITS_NO_ALIASES
+
+namespace units::aliases::isq::si::inline luminous_flux {
+
+template<Representation Rep = double>
+using lm = units::isq::si::luminous_flux<units::isq::si::lumen, Rep>;
+
+}  // namespace units::aliases::isq::si::inline luminous_flux
+
+#endif  // UNITS_NO_ALIASES
diff --git a/src/systems/si/include/units/isq/si/si.h b/src/systems/si/include/units/isq/si/si.h
index d7095a6e..369d6f3d 100644
--- a/src/systems/si/include/units/isq/si/si.h
+++ b/src/systems/si/include/units/isq/si/si.h
@@ -47,6 +47,7 @@
 #include <units/isq/si/inductance.h>
 #include <units/isq/si/length.h>
 #include <units/isq/si/luminance.h>
+#include <units/isq/si/luminous_flux.h>
 #include <units/isq/si/luminous_intensity.h>
 #include <units/isq/si/magnetic_flux.h>
 #include <units/isq/si/magnetic_induction.h>
diff --git a/test/unit_test/static/si_test.cpp b/test/unit_test/static/si_test.cpp
index 5155f916..ff32ecc7 100644
--- a/test/unit_test/static/si_test.cpp
+++ b/test/unit_test/static/si_test.cpp
@@ -239,6 +239,12 @@ static_assert(gray::symbol == "Gy");
 static_assert(milligray::symbol == "mGy");
 static_assert(kilogray::symbol == "kGy");
 
+// luminous flux
+
+static_assert(683_q_lm == 1_q_W);
+
+static_assert(lumen::symbol == "lm");
+
 /* ************** DERIVED DIMENSIONS IN TERMS OF BASE UNITS **************** */
 
 // speed