I have them under 400w Metal Halide, on the sand, off center from light getting about 300 PAR. However for the picture I moved the light directly over them so they were likely in about 500 PAR for the shot. The flow they are in is likely between low and moderate.
How this occurs I don't have any idea. Gary Parr answered this question once and all I remember him saying is it take a lot of light on the subject. Perhaps someone with knowledge could explain it. Also with the right picture you can help it a bit with Gimp or Photoshop like I did here.
Yes, to get a completely black background you make the subject super bright. The CMOS will adjust to bring the light of the whole image it's getting to "normal viewing" levels which darkens the background. This only works if the background isnt also as bright. Look directly at the sun, then try taking a picture with your camera. If it is set to auto white balance, it will dim the image so that the subject is "viewable" and not white washed.
Here is an example for those who may be interested of my LED unit i made.
http://www.aquatic-refuge.com/RandomPics/brightLED.jpgI had my 6500k 60w CFLs on at the time i took the pic, its really bright in that room, i unscrewed one of the recessed lights because it was so bright it would give me headaches. The LEDs were so bright that up close the white balance caused the image to dim so much that the not so bright background got blackend.
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