L.E.D. Vs HPS Lights And Marijuana Flower Density

Full spectrum LED grow lights vs. HPS grow lighting compared

I have recently read a lot about l.e.d lights and it seams most of the stuff im reading is coming from people with a interest in selling the product. In searching for a little solid evidence I ran across this YT video. Now provided that this vid was not rigged. The difference b/t the two systems doesn't look that dramatic - at least not considering the potential cost savings

That being said, with PG$E costing so much... and my interest in growing my own medical pot, with out breaking the bank as my primary concern L.E.D. dosen't look as bad as I had heard.

Anyone have first hand experience with this type of experiment?