Oops, typo... should be: "Luminous efficacy (lumen per watt) of white LED tips was 75 in 2010, is 150 in 2016, and will reach around 200 in 2020 (Fig 1.1). "
On Sun, Apr 2, 2017 at 11:04 AM, Stephen Ronan <[email protected]> wrote: > Interesting. I suppose the need for paths between rows of many crops > for tractor tires and/or farm workers reduces density for many crops > on farms relative to something like these shipping container farms > based in South Boston: https://www.freightfarms.com/ > I found the short videos there worth watching. One claims as much > lettuce can be grown in a shipping container as on two acres of > land... > > Apparently, the relatively low heat transfer from LED lights also > facilitates denser crops > http://www.urbanvine.co/june_16/why-purple-led-lighting-is-ideal-for-urban-farming > > In a preview snippet from this book "LED Lighting for Urban Agriculture" > http://www.springer.com/us/book/9789811018466 > I see: "Luminous efficacy (lumen per watt) of white LED tips was 75 in > 2010 is 50 in 2016 and will reach around 200 in 2020 (Fig 1.1). " > > On Sun, Apr 2, 2017 at 1:29 AM, Greg London <[email protected]> wrote: >>> LED light is so cheap we might be growing everything inside soon. >>> 24 hours a day. >> >> I'm not a grid expert, but I don't think the numbers add up for that. _______________________________________________ Hardwarehacking mailing list [email protected] http://lists.blu.org/mailman/listinfo/hardwarehacking
