I have almost no experience with separate IR illuminators, but I have years of experience arresting people while wearing NVG's.
For maximum brightness, you might be better off with a tactical incandescent like a Surefire G2 with an IR filter, with a jury rig to your helmet, hat or head--duct tape, sweatband, whatever. It's probably horribly inefficient, but it will probably throw out a stronger beam than any little 5mm LED and a flip of the lens cover gets you white light once the action is over. My IR light is a Maxabeam with IR filter--that throws to the next county--or nation if I aim it south. I am usually in areas that have enough ambient light that I don't need additional illumination. When I do, I use visible light, but my situation isn't unusually dangerous. If it were, I'd be shopping for IR gear, too.