diff --git a/res/scripts/light-oscillate.lua b/res/scripts/light-oscillate.lua
new file mode 100644
index 000000000..6a2848842
--- /dev/null
+++ b/res/scripts/light-oscillate.lua
@@ -0,0 +1,8 @@
+local theta = 0
+
+function readLight()
+	theta = math.fmod(theta + math.pi / 120, math.pi * 2)
+	return (math.sin(theta) + 1) * 75
+end
+
+emu:setSolarSensorCallback(readLight)