I spent a couple of days at the PTI Farm last year. (Excellent facility and research, if you get the chance.) They were studying GL for, I think, the second year. Some take-away thoughts from that:

• The system *should* work. It isn't rocket science. An atmospheric electrical discharge will produce nitrate N from diatomic N in the air. A fine mist of water *should* capture a percentage of the water soluble nitrate.
• The amount of nitrate N in the GL water *should* be measurable; municipalities test their water for nitrates all the time.
• The efficiency of the process hinges heavily on water quality. They found that minerals in well water quickly gummed up the works. They had switched to distilled water.
• Perhaps because of this, GL water from different sources may vary widely in N content. This, in turn, may explain the reluctance to make claims about N content.
• GL users need a quick and reliable way to measure nitrate concentration before applying the product. Otherwise, it's anyone's guess what was actually applied.