diff --git a/script/optics/PhotonFluxSpectrum.py b/script/optics/PhotonFluxSpectrum.py
index 3e1b9e79..35261f8f 100644
--- a/script/optics/PhotonFluxSpectrum.py
+++ b/script/optics/PhotonFluxSpectrum.py
@@ -8,9 +8,9 @@ AuxCurrent: not connected
 
 import time
 
-#RANGE = "G1200 full"
+RANGE = "G1200 full"
 #RANGE = "G600 full"
-RANGE = "C K-edge"
+#RANGE = "C K-edge"
 BEAM = "G1200 1x1"
 #BEAM = "G1200 6x10"
 
@@ -23,7 +23,7 @@ if RANGE == "G600 full":
     DWELL = 1.0
 elif RANGE == "G1200 full":
     # G1200 full spectrum
-    STARTPOS = (100.0)
+    STARTPOS = (125.0)
     ENDPOS = (2000.0)
     STEPS = 25.0
     LATENCY = 5.0