Bigheads don't like lights and the vibration of a generator.

When we shoot them at night we use a 12 volt spot light or the Hawglites (bow mounted flashlights).

The advantage to shooting them at night is that they tend to come right up to the surface in big groups at night. Also there are generally less boats/people around at night which can be a plus. This is how we do it:
1) keep all lights off ('cept for the required navigation lights)
2) You need the water to be pretty calm and there needs to be a touch of ambient light. (a street light, moon) Ideally, you'll be able to see the ripples as they feed toward you.
3) When you think the fish/school is in range, get ready, draw bows and shine the light on them. Shoot. You'll have just a second or two before they all dive.
4) Reel fish in... Repeat.



Personally, I prefer shooting them during the day.