Articles
The effects of the spectrum of the artificial light on the light use efficiency of roses
Article number
1337_7
Pages
49 – 56
Language
English
Abstract
The cultivation of cut flowers such as roses at higher latitudes is highly energy demanding, due to the need for artificial light to supplement sun radiation in the winter.
Energy and labour are the two main cost components in commercial rose cultivation in the Netherlands.
Saving energy while maintaining the high production and quality standard is an important driver for innovation.
The replacement of the commonly used high pressure sodium (HPS) lamps by the more energy-efficient light emitting diodes (LED) lamps, can make possible to reduce the electricity demand for artificial light.
An added advantage of LEDs is that they allow to tailor the light spectrum in the greenhouse.
However, the replacement of HPS lamps by LEDs in greenhouse increases the heat demand in winter to compensate for the loss of radiative heat.
This is why hybrid lighting systems consisting of a mixture of both types of lamps are an interesting alternative.
This paper describes an experiment that was conducted in a commercial rose nursery with the cut rose Avalanche+, where a hybrid light system was installed.
The light installation consisted of 103 µmol m‑2 s‑1 PAR from HPS lamps combined with Valoya LED lamp G1 with a light spectrum specially engineered for a hybrid installation to be mixed with HPS. Two different LED light intensities: 57 or 103 µmol m‑2 s‑1 PAR were combined with the HPS light.
Compared to the conventional installation of the company (191 µmol m-2 s-1 HPS), the spectrum of the hybrid installation in both intensities increased the light use efficiency (LUE) by the crop, expressed as grams of produce (roses) per mol light (natural + artificial) received.
This offers possibilities for energy saving, provided the energy efficiency of the lamps used is at least 1.7 µmol PAR per watt electric.
Energy and labour are the two main cost components in commercial rose cultivation in the Netherlands.
Saving energy while maintaining the high production and quality standard is an important driver for innovation.
The replacement of the commonly used high pressure sodium (HPS) lamps by the more energy-efficient light emitting diodes (LED) lamps, can make possible to reduce the electricity demand for artificial light.
An added advantage of LEDs is that they allow to tailor the light spectrum in the greenhouse.
However, the replacement of HPS lamps by LEDs in greenhouse increases the heat demand in winter to compensate for the loss of radiative heat.
This is why hybrid lighting systems consisting of a mixture of both types of lamps are an interesting alternative.
This paper describes an experiment that was conducted in a commercial rose nursery with the cut rose Avalanche+, where a hybrid light system was installed.
The light installation consisted of 103 µmol m‑2 s‑1 PAR from HPS lamps combined with Valoya LED lamp G1 with a light spectrum specially engineered for a hybrid installation to be mixed with HPS. Two different LED light intensities: 57 or 103 µmol m‑2 s‑1 PAR were combined with the HPS light.
Compared to the conventional installation of the company (191 µmol m-2 s-1 HPS), the spectrum of the hybrid installation in both intensities increased the light use efficiency (LUE) by the crop, expressed as grams of produce (roses) per mol light (natural + artificial) received.
This offers possibilities for energy saving, provided the energy efficiency of the lamps used is at least 1.7 µmol PAR per watt electric.
Authors
N. García Victoria, S. Pot, S. Kotiranta
Keywords
Avalanche+, energy saving, far red, high pressure sodium lamps, HPS, hybrid lighting, LED
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