Articles
INCREASE OF EFFICIENCY OF HORTICULTURAL LIGHTING
Article number
907_16
Pages
131 – 135
Language
English
Abstract
Technology of horticultural cultivation gives us a common knowledge that the production of all kind of crops directly depends on illumination level.
It is obvious that uniform illumination level can be achieved by using lighting equipment with different parameters of spatial light distribution.
Lighting system with wide light distribution provides volumetric irradiation when in one point of normalized plane rays fall from several (6-8) fixtures from different directions.
In this case a minimum of shadow zones arises; leaves of all layers of a plant are better lit in comparison with light level provided by luminaires with semi-wide or narrow light distribution.
In addition the volumetric irradiation is similar to natural conditions where the direction of solar rays falling on plants varies within a day.
Long-term practice of growing cucumber in the LLC Greenhouse Combine Maiski has shown that at equal normalized light exposure (or specific electric capacity) productivity in case of use of fixtures with wide light distribution (αmax=68°) on 20-25% is higher in comparison with use of fixtures with semi-wide light distribution (αmax=40°). Increase of efficiency of plant growth due to change of spatial characteristics of radiation of horticultural lighting at preservation of power expenses for its functioning is the important argument for further research and practical experiments in the given direction.
It is obvious that uniform illumination level can be achieved by using lighting equipment with different parameters of spatial light distribution.
Lighting system with wide light distribution provides volumetric irradiation when in one point of normalized plane rays fall from several (6-8) fixtures from different directions.
In this case a minimum of shadow zones arises; leaves of all layers of a plant are better lit in comparison with light level provided by luminaires with semi-wide or narrow light distribution.
In addition the volumetric irradiation is similar to natural conditions where the direction of solar rays falling on plants varies within a day.
Long-term practice of growing cucumber in the LLC Greenhouse Combine Maiski has shown that at equal normalized light exposure (or specific electric capacity) productivity in case of use of fixtures with wide light distribution (αmax=68°) on 20-25% is higher in comparison with use of fixtures with semi-wide light distribution (αmax=40°). Increase of efficiency of plant growth due to change of spatial characteristics of radiation of horticultural lighting at preservation of power expenses for its functioning is the important argument for further research and practical experiments in the given direction.
Authors
V.M. Pchelin, I.G. Ganiev, I.S. Muzafarov
Keywords
hemispherical illuminance, illumination, light distribution, lighting system, “volumetric” irradiation
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