Light-emitting diodes (LEDs) are the 4th plant supplemental lighting source. Pulsed lighting is benefit to increase energy utilization efficiency in greenhouse production. A pulsed-lighting LED luminaire with geometrical optical solution is proposed to overcome the shortcoming with pulse width modulation (PWM) solution. In addition, this luminaire also achieves uniform lighting by designing optical surfaces. In the illumination area, the lighting frequency is 117.6 Hz and the illuminance uniformity is 0.789, which is better than 0.75 (+/- 12.5%). In an actual planting experiment of Brassica chinensis, the average fresh weight of the plants under the pulsed-lighting LED luminaire was 33.1% higher than that under the conventional LED luminaire. The results showed that the energy utilization efficiency of the pulsed-lighting LED luminaire is 22.9% higher than that of the conventional LED luminaire.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1364/OE.483071 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Sustainable illumination: Experimental and simulation analysis of illumination for workers wellbeing in the workplace.
Heliyon
December 2024
Department of Industrial Safety, Faculty of Mining, St. Petersburg Mining University, St. Petersburg, Russia.
Incorporating an illumination optimization plan into the worker safety management process in industrials is essential since the quality of workplace illumination has a significant impact on workers' well-being. The purpose of this study was to optimize illumination conditions in industrial workspaces using light-emitting diode (LED) technology with a color temperature of 6500 K and a CRI of 85 %. To accomplish this, the DIALux illumination simulation tool was utilized.
View Article and Find Full Text PDFOptimisation of LED luminaires renewal interval based on proposed CLO adjustment method.
Heliyon
October 2024
The University of Auckland, Department of Electrical Computer and Software Engineering, Auckland, New Zealand.
A considerable part of electrical power is consumed in lighting systems. Electrical power usage and, as a result, generation is proportional to CO emissions. CO emissions result in climate change.
View Article and Find Full Text PDFNational Park visitors perceive benefits for themselves and wildlife under blended red-white outdoor lighting.
Sci Rep
September 2024
Rubenstein School of the Environment and Natural Resources, University of Vermont, Burlington, VT, USA.
Visitors to Colter Bay Village in Grand Teton National Park were surveyed to elicit their evaluations of experimental outdoor lighting conditions. Luminaires capable of dimming and switching between two LED modules (white, blended red-white) were installed in street and parking areas. The blended red-white lamps consisted of 30 narrowband LED with a peak wavelength 623 nm and two 3000 K white LEDs.
View Article and Find Full Text PDFOptimizing Indoor Airport Navigation with Advanced Visible Light Communication Systems.
Sensors (Basel)
August 2024
DEETC-ISEL/IPL, R. Conselheiro Emídio Navarro, 1949-014 Lisbon, Portugal.
This study presents a novel approach to enhancing indoor navigation in crowded multi-terminal airports using visible light communication (VLC) technology. By leveraging existing luminaires as transmission points, encoded messages are conveyed through modulated light signals to provide location-specific guidance. The objectives are to facilitate navigation, optimize routes, and improve system performance through Edge/Fog integration.
View Article and Find Full Text PDFLED streetlight characteristics alter the functional composition of ground-dwelling invertebrates.
Environ Pollut
August 2024
Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH-8903, Birmensdorf, Switzerland.
Artificial Light at Night (ALAN) has been identified as a primary driver of environmental change in the 21st century with key impacts on ecosystems. At the same time, developments of LED lighting systems with adjustable parameters-such as color temperature and light intensity-may provide an opportunity to mitigate the negative effects of ALAN. To test the potential effects of LED properties, we conducted a comprehensive field study over two summers at three forest sites in Switzerland.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!