diff --git a/src/colour/photon.rs b/src/colour/photon.rs
index 299c005..b2732c3 100644
--- a/src/colour/photon.rs
+++ b/src/colour/photon.rs
@@ -1,4 +1,5 @@
 /// A quantum of light with a given wavelength and intensity
+#[derive(Clone, Default, Debug)]
 pub struct Photon {
     /// The wavelength in nanometres
     pub wavelength: f64,