Tag Archives: nsf


References Cited

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[32] Z.-C. Yang, C. Kubota, P.-L. Chia and M. Kacira, “Effect of end-of-day far-red light from a movable LED fixture on squash rootstock hypocotyl elongation,” Elsevier Scientia Horticulturae Volume 136, 1 March 2012, Pages 81-86, 01 03 2012. [Online]. Available: https://www.sciencedirect.com/science/article/pii/S0304423811006698?via%3Dihub.
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Light Coverage

According to the manufacturer, the light source we had used in one of our prototypes has a beam spread of 115 degrees.


Although we ran the LED array at 1.4 A constant current, we are able to safely double the current to 2.8 A by keeping the case temperature under 25 degrees Celsius with our heat sink that has a large plate transfer area coupled with water cooling.

The doubling of the current doubles the amount of light from the same device, and cuts the number of lights a farmer needs in half.

With the 115 degree light spread, we are able to space our microgreens pans vertically every 7.5″ with nutrient film hydroponics, 8.5″ with coconut weave mat, and 9.5″ with Speedling floating trays.

Pest and disease pressures are not addressed and nutritional advantages are not supported

Pest and Disease Pressures

Controlled environment agriculture does not have the exposure of outdoor grown crops where pests, diseases, and weather damage most likely occur. Each rack of pans operates independently of the others in its own closed loop, and racks of pans may be further isolated inside grow tents that operate as a clean rooms with completely independent environments. Chieri Kubota addresses chemical fumigants to control pest and disease in crops not grown in a controlled environment in her video (5:12) https://hq.net0ag.com/chieri-kubota/ and wrote a supporting letter for our grant https://hq.net0ag.com/supporting-letter-chieri-kubota/

Nutritional Advantages

Nutritional advantages for microgreens as opposed to their mature counterparts has been extensively researched and published.


Cooling the Lights

Microgreens grown without soil in a coconut mat with our first commercial system that went into service 11/11/2017, the day after we filed for our patent.

We had a person concerned about the recirculating water used to cool the LEDs being returned to hydroponics as waste heat. The recirculating water used to cool the LEDs has no measurable waste heat. The thin steel pans with large surface areas dissipate heat from the lights at the case for the LEDs mounted directly to the steel with a thermal adhesive. The large surface areas of water on one side and steel on the other effectively reach a thermodynamic equilibrium with the controlled environment that has temperature and humidity control. The recirculating water had no measurable temperature change with the lights on or off measured with a Fluke Model 179 Multimeter that has an integrated temperature probe with a thermocouple that measures -40 to 260 deg C.

Heat from LEDs recirculates to the top pan, and is re-used for that germination area. We eliminate the heating pad that others use for their germination area. The thermodynamic design with cooling from the recirculation of water eliminates the active cooling that others use with nearly 40 mechanical and electrical parts including steel chassis, power supply, machined aluminum heat sink, and fans. Our system is the most efficient system regarding energy and cost on the market today. We reduce waste in heat and electrical energy. Our power supply operates at 95% efficiency with no loss in the electronic dimmer used to match the LED output to the measured photosynthetic photon flux density (PPFD) at the plant canopy. This closed loop tuning of the light to the plant is the most efficient method possible. Our LED has a output (PPFD) of 4600 umol/m^2*s at the surface measured with my Quantum PAR Meter. When a plant needs 800 umol/m^2*s at the plant canopy at a distance that varies as the plant grows, we are able to tune in exactly what the plant needs without any waste. Our research involves light frequencies outside the currently measured 400 – 700 nm for photosynthetically active radiation (PAR). One specific frequency produces a 20% increase in crop yield that is non trivial.

LED lighting chassis, fans, power supply, hardware, and finned aluminum heat sink eliminated

Cree CXA3070 LED


System with Rack of Stacked Pans

2.1 A Power Supply

Bridgelux LED 2.1 A on bottom, and Cree LED 1.4 A on top

Microgreens sell for up to $80 per pound from an urban agriculture company in Richmond, Virginia