My buddies have always had issues with the 'glow' from the infrared cameras.  They believe that this tends to spook the deer, and state that a traditional game camera flash won't.  Their arguments were that the game camera flash was like lightening to a deer.  It flashes and is gone and won't spook them.

Well, you aren't going to get any nighttime videos with a flash camera, and I agree that while in video mode, I have had deer staring at my infrared sensors.  I think that the infrared "flash" in picture mode, is much less likely to spook a deer though.  Since it doesn't light up the area, I don't believe they are as apt to notice it, unless they happen to be staring directly at the sensors at the time it flashes.

Well, I stumbled across this video today showing a nice buck getting spooked by a game camera flash.  Sorry guys, it looks like this refutes your argument.

Enjoy.