LED systems are becoming more sophisticated. They can be dimmed and offer multiple, independently adjustable colour channels. This makes light measurements more complex, while growers still want assurance that their installation performs as promised. In response, WUR - working with manufacturers and advisers - has developed a new light measuring protocol that provides a clear, practical standard for the sector.
Old protocol no longer suited to today's practice
A new LED installation is a significant investment, and growers want to be certain that they are getting value for money. Yet until now, measurements were still based on a 2010 protocol. Since then, both sensor technology and LED systems have evolved rapidly. Modern installations use dimmable channels and variable colour settings, aspects that were not captured in the old protocol. Following requests from industry, WUR has therefore created a new protocol aligned with current practice.
Clear industry requirements as the foundation
Interviews with manufacturers and advisers helped define the key requirements. The protocol needed to specify every step, define the number of measurement points and set out which sensors may be used. A full measurement had to be feasible within ninety minutes. WUR tested a range of sensors in research greenhouses under different light colours, temperatures and positions. The results were converted into clear, practical instructions that allow any LED installation to be measured reliably within the required time.
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Practical calculation tool
The new protocol includes a calculation tool in which users can enter measurements from all points. It automatically generates the key figures growers want to see, such as average light intensity per colour channel and the uniformity of light distribution in the greenhouse.
Field-tested and freely available
The development of the new protocol was funded by the Dutch national programme Kas als Energiebron (greenhouse as a source of energy). During the project, WUR cooperated with Hortilux, Philips, Agrolux and Oreon, with input from Multi-meet, Groeilicht advies, Ledgnd and Orance. The protocol has been tested in practice and appears well-suited. The protocol is freely available in Dutch and English.
For more information:
Wageningen University & Research
www.wur.nl
