fixed boolean on light

iexcode/instruments/Octupole.py

@@ -552,9 +552,9 @@ def Octupole_light(ON_OFF):
     Previously:light
     """
     light_pv = '29ide:9440:1:bo_1.VAL'
-    if ON_OFF.lower() == 'on':
+    if ON_OFF.lower() == 'off':
         light=0
-    elif ON_OFF.lower() == 'off':
+    elif ON_OFF.lower() == 'on':
         light=1
     caput(light_pv,light)
     print(("Turning light "+ON_OFF+"."))