You are now visiting our Global professional lighting website, visit your local website by going to the USA website
You are now visiting the Philips lighting website. A localized version is available for you.

    Research by Signify and WUR shows that temporarily extending daylength significantly increases yield in cannabis cultivation


    August 15, 2022


    • Extending lighting from 12 to 18 hours can increase yield by up to 20%, depending on timing and cultivar 
    • New light recipe enables control over the potency of cannabinoids/amount of active substances


    Eindhoven, the Netherlands – Signify (Euronext: LIGHT), the world leader in lighting, and Wageningen University & Research (WUR) have created a light recipe which extends the flowering phase of medicinal cannabis, leading to higher yields. By upping the photoperiod – that is, the length of daylight – from 12 to a maximum of 18 hours per day, the yield can increase by up to 20%. Timing is crucial in this: it must be a pre-harvest treatment, and the right moment differs per cultivar.


    Dr. Céline Nicole, senior plant specialist at Signify, says: “We have developed and patented a ground-breaking light recipe with which we can safely extend the daylength without interrupting the flowering phase. To successfully achieve this, the right moment and length of time in which to raise the light sum is very important.” Applying light for a longer period of time and generating higher yields means that growers can improve their return on investment on their LEDs.

    Multiannual research by Signify and WUR


    These new insights result from many years of joint research between WUR and Signify, conducted at WUR’s research facilities. This included experiments with different variations in light intensity, length and spectrum. The research targets specific challenges in the cultivation of medicinal cannabis, such as the management of the flowering phase, the uniformity of the crop and the homogeneity of the cannabinoids.


    Professor Leo Marcelis, research leader and supervisor of PhD student Wannida Sae-Tang, says: “It is fascinating to see how the cannabis plant responds to the different aspects of light i.e., daylength, intensity, daily light integral, spectrum, direction and how it interacts with other growth conditions. Growers will see tangible benefits from them.” Nicole adds: “Our lighting strategy of increasing the photoperiod from 12h to 18h with an installation delivering 1000 µmol/m2/s, in practice would make the crop experience a light sum equivalent to a lighting installation of 1500 µmol/m2/s. And therefore, the grower would be saving a lot on lighting fixtures as well”.

    Multiannual research by Signify and WUR

    The optimal spectrum


    The second important result from this research concerns the light spectrum: using certain colors can influence the potency of cannabinoids. Though unable to share confidential details about the light recipe, WUR and Signify are certain that it will help to reach a constant level of cannabinoids. Controlling the potency is essential in medicinal cannabis cultivation. Certain colors in the spectrum affect and safeguard the potency within a certain bandwidth says Dr. Nicole.

    From research to application


    According to Dr. Nicole, growers will be able to put these new insights into practice right when starting their new growth cycle. “One of the consequences of longer lighting is that you also have to adjust other aspects of your cultivation, like climate control, irrigation, and nutrients. As long as you adjust these parameters for the photoperiod, our research shows that you would achieve accompanying results.” The final trial of this research will be performed and finalized this autumn, after which Signify will share more information about its outcome.

    cannabis plant at harvest after experiencing a longer photoperiod.

    cannabis plant at harvest after experiencing a longer photoperiod.

    Photo credits Wannida Sae-Tang

    cannabis plant under 12h photoperiod.

    cannabis plant under 12h photoperiod.

    Photo credits Wannida Sae-Tang

    For further information, please contact:


    Global Marcom Manager Horticulture at Signify

    Daniela Damoiseaux

    Tel: +31 6 31 65 29 69


    About Signify

    Signify (Euronext: LIGHT) is the world leader in lighting for professionals and consumers and lighting for the Internet of Things. Our Philips products, Interact connected lighting systems and data-enabled services, deliver business value and transform life in homes, buildings and public spaces. With 2021 sales of EUR 6.9 billion, we have approximately 37,000 employees and are present in over 70 countries. We unlock the extraordinary potential of light for brighter lives and a better world. We achieved carbon neutrality in 2020, have been in the Dow Jones Sustainability World Index since our IPO for five consecutive years and were named Industry Leader in 2017, 2018 and 2019. News from Signify is located at the Newsroom, Twitter, LinkedIn and Instagram. Information for investors can be found on the Investor Relations page.

    Contact us

    Contact certified partners


    Philips products are sold through a global network of certified partners. Find partners in your region for more information about Philips LED grow lights.

    Contact Philips


    What are the best LED grow lights for your situation? We are here to help. Please use our form to submit your request.



    Learn more about LED lighting in horticulture by reading our latest articles and case studies.