LED installations are becoming increasingly sophisticated. They can be dimmed and offer multiple, individually adjustable light colours. This makes measurements of LED light more complex, while growers do want certainty that what has been agreed is delivered. This is why WUR, together with manufacturers and consultants, has developed a new light measurement protocol that provides a clear standard for the sector.
Purchasing a new LED installation is a major investment. Growers therefore like to be sure they are getting value for money. Yet until now, light was measured using a protocol from 2010. Since then, both sensor technology and LED technology have changed significantly. Modern systems work with dimmable light channels and variable colours, something the old protocol did not take into account. At the industry's request, WUR has therefore worked on drafting a new light measurement protocol in line with current practice.
Light measurement protocol based on industry requirements
Interviews with manufacturers and advisers revealed which requirements the new light measurement protocol had to meet. For instance, it had to clearly describe which operations are required, how many measurement points are used and which sensors are allowed. In addition, complete measurements had to be completed in an hour and a half . Various sensors were then tested in research greenhouses at different light colours, temperatures and positions. The results were translated into clear instructions so that a lighting installation can be reliably measured in an hour and a half.
Practical calculation aid
The new light measurement protocol also contains a calculation aid, in which the light measurements of all measuring points can be entered. The calculator then calculates all the data the grower would like to see, such as the average light intensity per light colour and the uniformity of the light in the greenhouse.Tested in practice and freely available
The development of the new light measurement protocol was funded by Kas als Energiebron (Greenhouse as Energy Source). The project involved close cooperation with Hortilux, Philips, Agrolux and Oreon, with input from Multi-meet, Groeilicht advies, Ledgnd and Orance. The protocol has already been tested in practice and experienced as well applicable. The protocol is available to everyone in Dutch and English.
Source: WUR, photo by Arielle Leenheer via Pixabay
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