Category Archives: reference


References Cited

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[24] NetZero // Urban Agriculture, “Microgreens – Market Rate,” [Online]. Available:
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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.

Chieri Kubota – Video on Optimizing Plant Performance

Chieri Kubota’s video published on the SciTechReports YouTube channel on June 11, 2012 titled “Optimizing Plant Performance – Plants Spliced, LED Lights Glow, & Strawberries Bloom” addresses the need for plants to have specific colors of LED lights including far red (2:20), red (2:45), and blue (3:17) to engineer plants with superior traits. She also mentions enhancing the flavor of strawberries in a controlled environment (4:38), lack of strawberries grown in green houses in the United States as opposed to Japan (5:02), chemical fumigants to control pest and disease in crops not grown in a controlled environment (5:12), and that a strawberry crop is a good candidate for local production with better worker efficiency and production (5:44).

Microgreens – Market Rate

At Food Peddler Co-op in Vancouver, Canada, the market rate for kohlrabi microgreens ($20/140g*28g/oz *16oz/lb*1 US$/1.32 Canadian$) is US $48 per pound. At Gourmet Greens, LLC in Richmond, VA, the specialty microgreens (sweet golden corn, hot radical radish, and micro spicy mix) 2016 price was $48 per pound. The 2018 price is $80 per pound for swiss chard, beets, and basil. The market rate has nearly doubled in two years.

2016 Microgreens Market Rate

2018 Microgreens Market Rate

Vint Cerf on Sensor Feedback for Optimized Growing Potential

Vint Cerf is on the Board of Directors at National Science Foundation, and gave me permission to use his quote about my patent pending design.

“Your ability to control light spectrum remotely and under computer management supports an intriguing scenario in which sensor feedback can be used to optimize growing potential.” Vinton G. Cerf, Internet Pioneer 10/2017

I had communicated with Vint Cerf about using Internet of Things (IoT) with IP on everything along with digital signal processing for closed loop control of urban agriculture light spectrum. We had met around the turn of the millennium, and had discussed using similar technology in the audio spectrum. Bringing that technology into urban agriculture will give us unprecedented control over the daily light integral over the entire life cycle of plants.

Vint Cerf and Jim Ray