What is the true field infrared emitter?

[scottm87]

I was at the IR seminar at nats (which, BTW, was awesome considering it was both organized and presented by some students), and one of the issues that came up was reflection of the IR off field components. A team (sorry, forgot the number) described to me some tests they did on the field, where they found that the IR on the true field was so much more powerful, that reflections were much more common than with the relatively low power emitters given in the kits...

My question is: What is the actual emitter used on the field? Where can you purchase it? If I do any more IR development, I would like to mimic as closely as possible the true field conditions, and this is very important.