diff --git a/sway/.config/sway/shared.d/brightness_ctl b/sway/.config/sway/shared.d/brightness_ctl
new file mode 100644
index 0000000..62b415d
--- /dev/null
+++ b/sway/.config/sway/shared.d/brightness_ctl
@@ -0,0 +1,4 @@
+# set brightness logarithmically by factor 1.4
+# .72 is just slightly bigger than 1 / 1.4
+bindsym --locked XF86MonBrightnessUp exec light -S "$(light -G | awk '{ print int(($1 + .72) * 1.4) }')"
+bindsym --locked XF86MonBrightnessDown exec light -S "$(light -G | awk '{ print int($1 / 1.4) }')"