To do this right, all lights need to be mounted on a standard height fixture. Like a 3' to 4' high saw horse, and measured with a light meter at specified distances. This way all lights start on equal ground and the measured results will be more accurate for each brand.
I have never believed photo's or video of a lights performance. Each brand of camera or video have different qualities in regards to night filming. Good camera's with adjustments & shutter stops can make the worst Chinese light look as good as a top brand light. So to take a picture of a light in action can be deceiving. But scientific results in a controlled environment bring much more credibility to the experiment.