(11-22-2013, 07:39 AM)Octo Wrote: I think LEDs are a great invention and sure, the sun, wind and rain would be optimal, but this is not the case all the time. Droughts, floods and other crap weather ruin crops easily and outdoors irrigation is a horrific waste of freshwater, especially in warm climates. Up here where all veggies are grown in greenhouses, because of the climate of course, they still use HPS lights for the reason that LEDs don't generate heat so a heating system would have to run in addition. There wouldn't be much savings in it, at least not for the growers.
Actually,,,it may be a great idea,,,like he said LEDs are expensive,,,
but they last a long time,,,and are very efficient,,,but like you said,,,
generate little heat,,,and probably fine to eat,,,and I could not find
any Monsanto link to them,,,and I looked some,,,for the heck of it,,,
no pesticides is nice,,,so,,,certainly where green houses are already
being used,,,it would be a good idea...
I'm pretty sure it's not evil technology
Quote:LEDs allow production of bright, and long-lasting grow lights that emit only the wavelengths of light corresponding to the absorption peaks of a plant's typical photochemical processes. Compared to other types of grow lights, LEDs for indoor plants are attractive because they do not require ballasts and produce considerably less heat than fluorescent lights, LED's usually run at around 45-60 degrees celsius and a slow airflow keeps them at their operating temperature. This allows LEDs to be placed closer to the plant canopy than other lights. Also, plants under LEDs transpire less, as a result of the reduction in heat, and thus the time between watering cycles is longer.http://en.wikipedia.org/wiki/Grow_light#LED
There are multiple absorption peaks for chlorophyll and carotenoids, and LED grow-lights may use one or more LED colors overlapping these peaks.
Recommendations for optimal LED designs vary widely. According to one source, to maximize plant growth and health using available and affordable LEDs, U.S. patent #6921182 from July 2005 claims that "the proportion of twelve red 660 nm LEDs, plus six orange 612 nm LEDs and one blue 470 nm LED was optimal", such that the ratio of blue light to red & orange light is 6-8%.
It is also often published that for vegetative growth, blue LEDs are preferred, where the light has a wavelength somewhere in the mid-400 nm (nanometers). For growing fruits or flowers, a greater proportion of red LEDs is considered preferable, with light very near 660 nm, the exact number this wavelength being much more critical than for the blue LED. Further research has shown that infrared and ultraviolet diodes give a full spectrum needed for flowering plants to effectively grow and flower.
Early LED grow lights used hundreds of fractional-watt LEDs and were often not bright enough and/or efficient enough to be effective replacements for HID lights. Newer advanced LED grow lights may use high-brightness multiple-watt LEDs, with growing results similar to HID lights, although very few LED growing lights produce enough light and colour mix to ensure good growth.
Grow light LEDs are increasing in power consumption resulting in increased effectiveness of the technology. LEDs used in previous designs were 1/3rd to 1 watt in power. However, 3-watt and even 5-watt LEDs are now commonly used in LED grow lights. LED grow lights are now being produced which exceed 1200 watts.
Recent experiments show that providing plants with white LED is also viable because LED colour is achieved by using different compounds during manufacture, thus it is possible to give all the wavelengths required with a white LED. This is not recommended however as it is generally thought wasteful in using energy to produce non required light.
That's why it's pink.
All technology is evil,,,
well,,,someone told me that once,,,and yeah,,,
looks like the trick is getting enough light,,,and not wasting power,,,
so,,,guess the 90 percent water savings is over growing outside???,,,
no magic lights do that,,,and the triple growth rate is leaving the lights
on all the time,,,so shorter growing season,,,over outside,,,
so really nothing here but replacing the lights with LEDs,,,hmmmm,,,
big whoop,,,everyone is doing that,,,
and the colors were already figured out,,,
and its all been done before,,,and NASA did it in space,,,
and these guys got the clue???,,,wow,,,really dressing this up a lot...
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