diff --git a/src/aare/gui/panels/monochromator_panel.py b/src/aare/gui/panels/monochromator_panel.py
index 56b98f4b..499ac290 100644
--- a/src/aare/gui/panels/monochromator_panel.py
+++ b/src/aare/gui/panels/monochromator_panel.py
@@ -12,7 +12,8 @@ from aare.gui.widgets.title_label import TitleLabel
 # daq.change_energy forwards straight to bec) — confirm the real monochromator
 # limits with the Beamline Scientist. Shared by both Set Energy rows.
 # X10SA mono reaches 6-30 keV; others keep the placeholder until confirmed.
-ENERGY_MIN_KEV, ENERGY_MAX_KEV = (6.0, 30.0) if mx_beamline() == MXBeamline.X10SA else (4.0, 20.0)
+# in the 6124 planner it says 10 to 20 keV at PXII
+ENERGY_MIN_KEV, ENERGY_MAX_KEV = (10.0, 20.0) if mx_beamline() == MXBeamline.X10SA else (4.0, 20.0)
 # "arrived" window for the moving->neutral transition; per-hardware knob like
 # MotorMoveGroup's tol (the mono never lands exactly on the setpoint)
 ENERGY_AT_TARGET_TOL_KEV = 0.001