diff --git a/nhf/tool/light_panel.py b/nhf/tool/light_panel.py
index 81c2942..1818b17 100644
--- a/nhf/tool/light_panel.py
+++ b/nhf/tool/light_panel.py
@@ -52,3 +52,12 @@ class LightPanel(Model):
             ])
             .rect(w0, self.grid_height, mode='s')
         )
+
+
+if __name__ == '__main__':
+    import sys
+
+    p = LightPanel()
+    if len(sys.argv) == 1:
+        p.build_all()
+        sys.exit(0)