diff --git a/script/optics/PhotonFluxSpectrum.py b/script/optics/PhotonFluxSpectrum.py
index ca8076f3..07cac231 100644
--- a/script/optics/PhotonFluxSpectrum.py
+++ b/script/optics/PhotonFluxSpectrum.py
@@ -33,6 +33,9 @@ elif RANGE == "carbon edge":
     LATENCY = 1.0
     DWELL = 1.0
 
+KEI_DIODE = "X03DA-KEITHLEY-1:"
+KEI_RMU = "X03DA-KEITHLEY-2:"
+
 if BEAM == "G600 1x1":
     # G600 1x1 reference sscan_2268 (elog:119)
     SampleCurrentGain.write("L, 10^7")
@@ -67,9 +70,6 @@ else:
     # use current settings
     pass
     
-KEI_DIODE = "X03DA-KEITHLEY-1:"
-KEI_RMU = "X03DA-KEITHLEY-2:"
-
 def trig():
     wait_beam()
     caput(KEI_DIODE + "DOINIT", 1)