diff --git a/sbnobj/Common/Reco/CMakeLists.txt b/sbnobj/Common/Reco/CMakeLists.txt
index bcdd52a1..50eebbfd 100644
--- a/sbnobj/Common/Reco/CMakeLists.txt
+++ b/sbnobj/Common/Reco/CMakeLists.txt
@@ -3,6 +3,7 @@ cet_make_library(
     CNNScore.cc
     CRUMBSResult.cc
     FlashTriggerPrimitive.cc
+    LightCalo.cc
     MVAPID.cc
     MergedTrackInfo.cc
     OpT0FinderResult.cc
diff --git a/sbnobj/Common/Reco/LightCalo.cc b/sbnobj/Common/Reco/LightCalo.cc
new file mode 100644
index 00000000..cf35a897
--- /dev/null
+++ b/sbnobj/Common/Reco/LightCalo.cc
@@ -0,0 +1 @@
+#include "sbnobj/Common/Reco/LightCalo.h"
\ No newline at end of file
diff --git a/sbnobj/Common/Reco/LightCalo.h b/sbnobj/Common/Reco/LightCalo.h
new file mode 100644
index 00000000..75eb2efa
--- /dev/null
+++ b/sbnobj/Common/Reco/LightCalo.h
@@ -0,0 +1,47 @@
+/**
+ * @file   sbnobj/Common/Reco/LightCalo.h
+ * @brief  Defines data structures for light calorimetry products.
+ * @author Lynn Tung 
+ * @date   December 2nd, 2025
+ *
+ */
+
+#ifndef sbnobj_LightCalo_H
+#define sbnobj_LightCalo_H
+
+#include <limits>
+
+namespace sbn{
+
+  /**
+   * @brief A simple class to store reconstructed charge, light, and visible energy.
+   */
+
+  class LightCalo {
+  public:
+
+    // NaN value to initialize data members
+    static constexpr double nan = std::numeric_limits<double>::signaling_NaN();
+
+    /// @name Reconstructed charge, light, and visible energy data members.
+    /// @{
+    double charge = nan;   ///< Total charge in a reconstructed interaction (recob::Slice) [# of electrons]
+    double light  = nan;   ///< Total light  in a reconstructed interaction (recob::Slice + recob::OpFlash) [# of photons]
+    double energy = nan;   ///< Total visible energy (sum of charge+light) for a reconstructed interaction [GeV]
+    int    bestplane = -1; ///< Plane that was used for the total charge
+    /// @}
+
+    /**
+     * Default constructor.
+     */
+    LightCalo() = default;
+    LightCalo(double charge, double light, double energy, int bestplane)
+      : charge(charge)
+      , light(light)
+      , energy(energy)
+      , bestplane(bestplane)
+      {} 
+  };
+}
+
+#endif
diff --git a/sbnobj/Common/Reco/classes.h b/sbnobj/Common/Reco/classes.h
index 02760d4d..ecd981af 100644
--- a/sbnobj/Common/Reco/classes.h
+++ b/sbnobj/Common/Reco/classes.h
@@ -28,6 +28,7 @@
 #include "sbnobj/Common/Reco/VertexHit.h"
 #include "sbnobj/Common/Reco/MVAPID.h"
 #include "sbnobj/Common/Reco/CRUMBSResult.h"
+#include "sbnobj/Common/Reco/LightCalo.h"
 #include "sbnobj/Common/Reco/OpT0FinderResult.h"
 #include "sbnobj/Common/Reco/CNNScore.h"
 #include "sbnobj/Common/Reco/TPCPMTBarycenterMatch.h"
diff --git a/sbnobj/Common/Reco/classes_def.xml b/sbnobj/Common/Reco/classes_def.xml
index cacd0bb9..889a855d 100644
--- a/sbnobj/Common/Reco/classes_def.xml
+++ b/sbnobj/Common/Reco/classes_def.xml
@@ -78,6 +78,22 @@
   <class name="art::Assns<sbn::crt::CRTHit, recob::Track, void>" />
   <class name="art::Wrapper<art::Assns<sbn::crt::CRTHit, recob::Track, void>>" />
 
+  <class name="sbn::LightCalo">
+  </class>
+  <class name="std::vector<sbn::LightCalo>" />
+  <class name="art::Wrapper<sbn::LightCalo>" />
+  <class name="art::Wrapper<std::vector<sbn::LightCalo>>" />
+
+  <class name="art::Assns<recob::Slice, sbn::LightCalo>" />
+  <class name="art::Wrapper<art::Assns<recob::Slice, sbn::LightCalo>>" />
+  <class name="art::Assns<sbn::LightCalo, recob::Slice, void>" /> 
+  <class name="art::Wrapper<art::Assns<sbn::LightCalo, recob::Slice, void>>"/>
+
+  <class name="art::Assns<recob::OpFlash, sbn::LightCalo>" />
+  <class name="art::Assns<sbn::LightCalo, recob::OpFlash, void>" />
+  <class name="art::Wrapper<art::Assns<recob::OpFlash, sbn::LightCalo>>" />
+  <class name="art::Wrapper<art::Assns<sbn::LightCalo, recob::OpFlash, void>>" />
+
   <class name="sbn::OpT0Finder">
   </class>
   <class name="std::vector<sbn::OpT0Finder>" />