Theres only a couple that I am aware of... DX and Solarforce. The DX one I bought delivers about .95A to the emitter. Not sure how that compares to the solarforce module , or a Q5 driven at a higher current.
You'd need to get them all together at once, loaded in similar hosts identical battery configurations... and let em' duke it out. I'm starting to think how the emitter is driven is just as important as the emitter bin.