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diff --git a/hw6/include/lightsource_base.h b/hw6/include/lightsource_base.h
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+/******************************************************************/
+/* This file is part of the homework assignments for CSCI-427/527 */
+/* at The College of William & Mary and authored by Pieter Peers. */
+/* No part of this file, whether altered or in original form, can */
+/* be distributed or used outside the context of CSCI-427/527     */
+/* without consent of either the College of William & Mary or     */
+/* Pieter Peers.                                                  */
+/******************************************************************/
+#ifndef _LIGHTSOURCE_BASE_H_
+#define _LIGHTSOURCE_BASE_H_
+
+#include <ostream>
+
+#include "vec3d.h"
+#include "lightSample.h"
+
+class lightsource_base {
+ public:
+  //////////////////
+  // Constructors //
+  //////////////////
+  lightsource_base(void) {}
+  lightsource_base(const lightsource_base&) = delete;
+
+  ///////////////
+  // Operators //
+  ///////////////
+  lightsource_base& operator=(const lightsource_base&) = delete;
+
+  /////////////
+  // Methods //
+  /////////////
+  virtual lightSample intensityAt(const vec3d& point) const = 0;
+
+  virtual lightSample emittanceAt(const vec3d& point, float r1, float r2) const = 0;
+
+  /////////////
+  // Friends //
+  /////////////
+  friend std::ostream& operator<<(std::ostream& s, const lightsource_base& lsb)
+  {
+    lsb._print(s);
+    return s;
+  }
+
+
+ protected:
+  //////////////////
+  // Friend class //
+  //////////////////
+  friend class lightsourceShader;
+
+  ///////////////////////
+  // Protected Methods //
+  ///////////////////////
+  virtual color _emittance(const class intersectionPoint& ip) const { return color(); }
+
+ private:
+  /////////////////////
+  // Private Methods //
+  /////////////////////
+  virtual void _print(std::ostream& s) const = 0;
+};
+
+#endif /* _LIGHTSOURCE_BASE_H_ */