diff --git a/script/optics/PhotonFluxSpectrum.py b/script/optics/PhotonFluxSpectrum.py
index 40011d3b..195dc408 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 = 5.0
+    LATENCY = 1.0
     DWELL = 1.0
 
 KEI_DIODE = "X03DA-KEITHLEY-1:"
@@ -77,6 +77,7 @@ else:
     pass
     
 def trig():
+    time.sleep(LATENCY)
     wait_beam()
     print time.asctime() + "init"
     caput(KEI_DIODE + "DOINIT", 1)
@@ -85,7 +86,7 @@ def trig():
     caput(KEI_DIODE + "DOTRIGGER", 1)
     caput(KEI_RMU + "DOTRIGGER", 1)
     caput("X03DA-OP-10ADC:TRG.PROC", 1)
-    #time.sleep(DWELL * 1.1)
+    time.sleep(DWELL)
     print time.asctime() + "fetch"
     caput(KEI_DIODE + "DOFETCH", 1)
     caput(KEI_RMU + "DOFETCH", 1)
@@ -98,5 +99,5 @@ RefCurrentAveraging.write(value)
 POSITIONERS = (Eph)
 SENSORS = (Keithley1, Keithley2, SampleCurrent, RefCurrent, MachineCurrent)
 
-lscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, LATENCY, before_read=trig, after_read=after_readout)
+lscan(POSITIONERS, SENSORS, STARTPOS, ENDPOS, STEPS, 0.0, before_read=trig, after_read=after_readout)