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LED Light Recipes to Extend Crop Harvest Period

Technology Overview

The majority of the local indoor farmers grow crops that are harvested for their leaves. One way to increase the growth rate of such leafy greens is to provide a longer period of light. However, some of the crops grown, e.g., spinach, are long-day plants that flower when the light periods are longer than their critical day-length. While important to a plant’s life cycle, this vegetative to reproductive phase change is undesirable for farmers, not only because it shortens the harvest period hence reducing the yield, but also because it changes the taste profile.

To tackle this problem, a light recipe that was able to suppress flowering was formulated. Plants grown under this light recipe showed a faster growth rate than those grown under flowering-suppressing short-day photoperiod. Moreover, they do not flower even when the light period has surpassed the critical day-length. Positive results were obtained when this light recipe was tested on spinach and arugula.

This technology would work for other long-day crops, and it will be beneficial to indoor farmers who are interested to try it.

Technology Features, Specifications and Advantages

The technology uses lights of different wavelengths to control the molecular switches, the phytochromes, of plants. It tricks the plant into suppressing its floral transition even when the long-day photoperiod is conducive for flowering. This is an improvement compared to the usual method of just providing short-day photoperiod to suppress flowering as the growth rate is now faster. This is particularly useful for crops, such as spinach and arugula, that can be harvested multiple times. With this extended harvest period, growers can have more cycles of continuous harvest within one batch of plant growth, thus increasing their yield. No additional chemical or Genetically Modified Organisms (GMO) are used to achieve this flowering repression.

Potential Applications

This LED light recipe for extension of crop harvest period is suitable for the following:

  • Farmers who are looking to improve and increase crop yields
  • Indoor farms that use LED lightings in their set ups.

Lighting developers or producers can be potential partners to provide this technology as a package.

Customer Benefit

  • Increased yield through:
    • The extended harvest period for crops that supports continuous harvesting
    • Overall reduction of waiting time for plant establishment during lag phase
  • Customizable recipes to suit different crop types

The current proof-of-concept stage has been completed and the team is looking for project collaborators or consultancy projects to test the technology on the client’s crop choice.

Contact Person

Damian Wong


Republic Polytechnic

Technology Category

  • Life Sciences
  • Agriculture & Farming

Technology Readiness Level


increase crop yield, crop growth rate, indoor farming, LED light recipe, plant growth, crop growth, short harvest crops, LED lights plants