do the ceiling bounce test. that'd show you really quick which puts out more light.
+1
The good old ceiling bounce is the next best thing to instrumentation.
Take the lights into a smaller sized room, preferably with white or light colored walls and ceilings. Alternatively shine one on the ceiling and then the other in the same place. Don't look up at the ceiling but look at the walls, floor and objects in the room. The eyes are really good at distinguishing between ambient light levels and that should help to determine which produces more overall light.