Incident metering and night doesn't necessarily work very well and I personally would advice against it. In sun light the sun is so to speak always the same, one has a value for sunlit areas and a value for shadows.
With artificial light, and floodlights in particular, the sources of light is ambiguous and/or not reachable - think the dome of a church lit by floodlights, one cannot go up the dome to measure what's the light there - its distance from the subject is important for exposure and any kind of "averaging" can be very misleading because of the great brightness range.
Imagine a street lamp on a house, projecting light on the house (an awful lot, but diminishing very fast) and on the street. In this situation an incident light meter is basically useless. Besides, light sources at night are often in the frame and they must not be counted as far as exposure calculation is concerned, and with an incident light meter one ends up always calculating, in the exposure, also the brightness of the street lamps.
"Table" exposure is as we agree quite reliable in this situation.