Matthew Smith , Apr 18, 2000; 06:43 a.m.
I think you may be referring to the black backgrounds in some pictures...? I apologize if you are not, please tell us where you heard that they take pictures at night.
Anyway, the black background is accomplished via ordinary flash, and many of those pictures with black backgrounds may in fact have been taken during mid day.
This is because a flash can light the scene more brightly than the regular daylight can, and the exposure John Shaw or the other pros used may not let in enough natural light to light the background, thus causing a black background.
Although many don't like these backgrounds, because, as you have noticed, they can consume some into thinking that they were taken at night, they are great for lighting dark subjects and stopping winds or fast moving insects.