diff --git a/script/optics/PhotonFluxSpectrum.py b/script/optics/PhotonFluxSpectrum.py
index dec0f1bb..99cfdcfa 100644
--- a/script/optics/PhotonFluxSpectrum.py
+++ b/script/optics/PhotonFluxSpectrum.py
@@ -30,7 +30,7 @@ elif RANGE == "C K-edge":
     STARTPOS = (270.0)
     ENDPOS = (310.0)
     STEPS = 0.5
-    LATENCY = 1.0
+    LATENCY = 0.0
     DWELL = 1.0
 
 KEI_DIODE = "X03DA-KEITHLEY-1:"