Photobiology eye safety for horticultural LED lighting: Transmittance performance of eyewear protection using high-irradiant monochromatic LEDs
Autor: | Mark Lefsrud, Bo-Sen Wu |
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Rok vydání: | 2017 |
Předmět: |
0106 biological sciences
Engineering Infrared Rays Infrared Eyewear Irradiance 01 natural sciences law.invention 03 medical and health sciences 0302 clinical medicine Optics law Occupational Exposure Transmittance Humans Lighting business.industry Public Health Environmental and Occupational Health Agriculture LED lamp 030221 ophthalmology & optometry Optoelectronics Eye Protective Devices business Welding goggles 010606 plant biology & botany Visible spectrum Light-emitting diode |
Zdroj: | Journal of Occupational and Environmental Hygiene. 15:133-142 |
ISSN: | 1545-9632 1545-9624 |
Popis: | Light emitting diodes have slowly gained market share as horticultural lighting systems in greenhouses due to their rapid improvement in color performances and light outputs. These advancements have increased the availability of the full spectrum of visible wavelengths and the corresponding irradiance outputs available to plants. However, light emitting diodes owners have limited information on the proper options for personal eyewear protection as the irradiance levels have increased. The objective of this study was to measure the light transmittance performance of 12 eyewear protection including welding goggles, safety goggles, polarized glasses, and sunglasses across the human visible spectrum (380-740 nm) up to an irradiance level of 1500 W·m-2 from high-irradiant light emitting diodes assemblies. Based on the spectral measurements, certain transmitted spectra exhibited spectrum shifts or an alteration in the bimodal distribution which were different than the light emitting diodes spectra, due to the uneven transmittance efficiencies of the glasses. As for the measured transmittance percentages in two experiments, each type of eyewear protection showed distinct transmittance performances, and the performance of the tested eyewear protection was not impacted by irradiance but was dependent on the wavelength. The mean light transmittance was 1.77% for the welding glasses, 13.12% for the polarized glasses, 15.27% for the safety goggles, and 27.65% for the sunglasses. According to these measured results and the spectral weighting exposure limits from the International Electrotechnical Commission 62471 and EU directive 2006/25, consumers and workers using horticultural lighting can select welding goggles or polarized glasses, to limit the possible ocular impact of the high irradiance of monochromatic light in electrical lighting environment. Sunglasses and safety goggles would not be advised as protection, especially if infrared radiation was used. |
Databáze: | OpenAIRE |
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