diff --git a/docs/physics/update_and_conv/update_and_conv.ipynb b/docs/physics/update_and_conv/update_and_conv.ipynb
index da9db07d389..b6d9094c3cd 100644
--- a/docs/physics/update_and_conv/update_and_conv.ipynb
+++ b/docs/physics/update_and_conv/update_and_conv.ipynb
@@ -462,8 +462,8 @@
     "#nu_lower = tardis_config.supernova.luminosity_wavelength_end.to(u.Hz, u.spectral)\n",
     "#nu_upper = tardis_config.supernova.luminosity_wavelength_start.to(u.Hz, u.spectral)\n",
     "\n",
-    "from tardis.spectrum.luminosity import calculate_emitted_luminosity\n",
-    "L_output = calculate_emitted_luminosity(transport.transport_state.emitted_packet_nu, transport.transport_state.emitted_packet_luminosity, nu_lower, nu_upper)\n",
+    "from tardis.spectrum.luminosity import calculate_filtered_luminosity\n",
+    "L_output = calculate_filtered_luminosity(transport.transport_state.emitted_packet_nu, transport.transport_state.emitted_packet_luminosity, nu_lower, nu_upper)\n",
     "L_output"
    ]
   },
diff --git a/tardis/simulation/base.py b/tardis/simulation/base.py
index 9059c28127e..c4c6b3c00e6 100644
--- a/tardis/simulation/base.py
+++ b/tardis/simulation/base.py
@@ -21,8 +21,7 @@
 from tardis.spectrum.base import SpectrumSolver
 from tardis.spectrum.formal_integral import FormalIntegrator
 from tardis.spectrum.luminosity import (
-    calculate_emitted_luminosity,
-    calculate_reabsorbed_luminosity,
+    calculate_filtered_luminosity,
 )
 from tardis.transport.montecarlo.base import MonteCarloTransportSolver
 from tardis.transport.montecarlo.configuration import montecarlo_globals
@@ -464,13 +463,13 @@ def iterate(self, no_of_packets, no_of_virtual_packets=0):
         if np.sum(output_energy < 0) == len(output_energy):
             logger.critical("No r-packet escaped through the outer boundary.")
 
-        emitted_luminosity = calculate_emitted_luminosity(
+        emitted_luminosity = calculate_filtered_luminosity(
             transport_state.emitted_packet_nu,
             transport_state.emitted_packet_luminosity,
             self.luminosity_nu_start,
             self.luminosity_nu_end,
         )
-        reabsorbed_luminosity = calculate_reabsorbed_luminosity(
+        reabsorbed_luminosity = calculate_filtered_luminosity(
             transport_state.reabsorbed_packet_nu,
             transport_state.reabsorbed_packet_luminosity,
             self.luminosity_nu_start,
diff --git a/tardis/spectrum/luminosity.py b/tardis/spectrum/luminosity.py
index 830b2650238..6e7f214d50c 100644
--- a/tardis/spectrum/luminosity.py
+++ b/tardis/spectrum/luminosity.py
@@ -2,19 +2,19 @@
 import numpy as np
 
 
-def calculate_emitted_luminosity(
-    emitted_packet_nu,
-    emitted_packet_luminosity,
+def calculate_filtered_luminosity(
+    packet_nu,
+    packet_luminosity,
     luminosity_nu_start=0 * u.Hz,
     luminosity_nu_end=np.inf * u.Hz,
 ):
     """
-    Calculate emitted luminosity.
+    Calculate total luminosity within a filter range.
 
     Parameters
     ----------
-    emitted_packet_nu :
-    emitted_packet_luminosity :
+    packet_nu : astropy.units.Quantity
+    packet_luminosity : astropy.units.Quantity
     luminosity_nu_start : astropy.units.Quantity
     luminosity_nu_end : astropy.units.Quantity
 
@@ -22,35 +22,8 @@ def calculate_emitted_luminosity(
     -------
     astropy.units.Quantity
     """
-    luminosity_wavelength_filter = (emitted_packet_nu > luminosity_nu_start) & (
-        emitted_packet_nu < luminosity_nu_end
+    luminosity_wavelength_filter = (packet_nu > luminosity_nu_start) & (
+        packet_nu < luminosity_nu_end
     )
 
-    return emitted_packet_luminosity[luminosity_wavelength_filter].sum()
-
-
-def calculate_reabsorbed_luminosity(
-    reabsorbed_packet_nu,
-    reabsorbed_packet_luminosity,
-    luminosity_nu_start=0 * u.Hz,
-    luminosity_nu_end=np.inf * u.Hz,
-):
-    """
-    Calculate reabsorbed luminosity.
-
-    Parameters
-    ----------
-    reabsorbed_packet_nu :
-    reabsorbed_packet_luminosity :
-    luminosity_nu_start : astropy.units.Quantity
-    luminosity_nu_end : astropy.units.Quantity
-
-    Returns
-    -------
-    astropy.units.Quantity
-    """
-    luminosity_wavelength_filter = (
-        reabsorbed_packet_nu > luminosity_nu_start
-    ) & (reabsorbed_packet_nu < luminosity_nu_end)
-
-    return reabsorbed_packet_luminosity[luminosity_wavelength_filter].sum()
+    return packet_luminosity[luminosity_wavelength_filter].sum()
diff --git a/tardis/spectrum/tests/test_luminosity.py b/tardis/spectrum/tests/test_luminosity.py
new file mode 100644
index 00000000000..9acad9bf6f8
--- /dev/null
+++ b/tardis/spectrum/tests/test_luminosity.py
@@ -0,0 +1,60 @@
+import astropy.units as u
+import numpy as np
+import pytest
+
+from tardis.spectrum.luminosity import (
+    calculate_filtered_luminosity,
+)
+
+
+@pytest.mark.parametrize(
+    "packet_nu, packet_luminosity, luminosity_nu_start, luminosity_nu_end, expected",
+    [
+        # All frequencies within the range
+        (
+            np.array([1, 2, 3]) * u.Hz,
+            np.array([10, 20, 30]) * u.erg / u.s,
+            0 * u.Hz,
+            4 * u.Hz,
+            60 * u.erg / u.s,
+        ),
+        # All frequencies outside the range
+        (
+            np.array([1, 2, 3]) * u.Hz,
+            np.array([10, 20, 30]) * u.erg / u.s,
+            4 * u.Hz,
+            5 * u.Hz,
+            0 * u.erg / u.s,
+        ),
+        # Mix of frequencies within and outside the range
+        (
+            np.array([1, 2, 3, 4]) * u.Hz,
+            np.array([10, 20, 30, 40]) * u.erg / u.s,
+            2 * u.Hz,
+            4 * u.Hz,
+            30 * u.erg / u.s,
+        ),
+        # Edge case: Frequencies exactly on the boundary
+        (
+            np.array([1, 2, 3, 4]) * u.Hz,
+            np.array([10, 20, 30, 40]) * u.erg / u.s,
+            2 * u.Hz,
+            3 * u.Hz,
+            0 * u.erg / u.s,
+        ),
+    ],
+)
+def test_calculate_filtered_luminosity(
+    packet_nu,
+    packet_luminosity,
+    luminosity_nu_start,
+    luminosity_nu_end,
+    expected,
+):
+    result = calculate_filtered_luminosity(
+        packet_nu,
+        packet_luminosity,
+        luminosity_nu_start,
+        luminosity_nu_end,
+    )
+    assert result == expected