Very informative article. I did some calculations to compare a 4' long Solaris vs the other MH/PC actinic lighting units sold by J&L. After you take into account the hydro savings & bulb replacement savings, it was only a couple hundred more over a five year span to buy the LED Solaris than with the older systems (it was a lot cheaper than the Geisemann unit). Also, I only used the 175w MH versions in my comparison, so if it is comparable to 250w MH, then the price difference would be even less.
Still, I will wait for later models before I consider replacing all my MH with LED lights.
Anthony
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