I could buy almost (7) gavi 600 de's for the cost of (1) Spydr...cost also has to be figured into your cost benefit analysis...we have this conversation at least once a week with the different, latest and greatest, LED manufacturers, needless to say there are any successful large scale LED grows that I have seen or been offered access to....In the production world "GPW" is a totally irrelevant number, we do not pay our bills per watt except electricity and we still break that down per square foot, all other bills are per square foot. Most everyone uses an output per square foot calculation like a retail store would and equipment as well as capitol investment is usually put on a 3 year return on investment/amortization calculation. It would take decades to get your money back on an LED light based on output and efficiency..the numbers just don't work.
Gavita, PL Lighting, and
Nanolux are the current game changer..we are starting to see over 3 lbs per light consistantly with mixed strains in a large scale production environments using less ac, less power, cheaper per fixture cost, with more quality output than that of traditional air cooled or open hood remote ballast setups.
Real info not opinion