From c6acac05670c59ee29353c63a9db166448da85bb Mon Sep 17 00:00:00 2001
From: Matthew Gordon <matthew@gordon.earth>
Date: Wed, 2 Sep 2020 23:21:53 -0400
Subject: [PATCH] Add Photon type

---
 src/colour/mod.rs    |  3 +++
 src/colour/photon.rs | 10 ++++++++++
 2 files changed, 13 insertions(+)
 create mode 100644 src/colour/photon.rs

diff --git a/src/colour/mod.rs b/src/colour/mod.rs
index e603a81..1fb5c1f 100644
--- a/src/colour/mod.rs
+++ b/src/colour/mod.rs
@@ -1,2 +1,5 @@
 pub mod colour_rgb;
 pub use colour_rgb::{ColourRgbF, ColourRgbU8, NamedColour};
+
+pub mod photon;
+pub use photon::Photon;
diff --git a/src/colour/photon.rs b/src/colour/photon.rs
new file mode 100644
index 0000000..299c005
--- /dev/null
+++ b/src/colour/photon.rs
@@ -0,0 +1,10 @@
+/// A quantum of light with a given wavelength and intensity
+pub struct Photon {
+    /// The wavelength in nanometres
+    pub wavelength: f64,
+    /// The intensity of the light
+    ///
+    /// Depending on context, this might represent actual intensity in W/sr,
+    /// radiant flux in W, irradiance in W/m^2, or radiance in W/(m^2sr).
+    pub intensity: f64,
+}