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Advances in LED lighting standards for plant growth and system recommendations Oct 26, 2017

Advances in LED lighting standards for plant growth and system recommendations


In contrast to the traditional lighting, LED light source can form a spectral absorption peak with the plant photosynthesis and its shape, and it has the advantages of high efficiency, low energy consumption, no mercury pollution, precise wavelength, intelligent control system and so on. More than 50% in the greenhouse fill light, plant tissue culture, plant plants and genetic breeding and many other fields have broad application prospects.

Incandescent lamps, fluorescent lamps, high pressure sodium lamps, high pressure mercury lamps and other traditional light sources, used in agriculture and biotechnology, the existence of low biological efficiency, high energy consumption and high operating costs of the lack of artificial light plant, for example, Accounting for 40% of the system operating costs to 60%. Compared with the traditional illumination, the LED light source can form the spectral absorption peak which is basically consistent with the plant photosynthesis and its shape. It has the advantages of high efficiency, low energy consumption, no mercury pollution, precise wavelength, intelligent control of the system and so on. %, In the greenhouse fill light, plant tissue culture, plant and genetic breeding and many other fields have broad application prospects.

This paper combs the standard progress of LED lighting for plant growth and explores the standard framework of LED lighting for plant growth. National Semiconductor Lighting Engineering R & D and Industry Alliance (CSA) since 2012 began to plant growth with LED lighting standardization work, released in 2013, the first group standard T / CSA021-2013 "plant growth with LED flat lamp performance requirements"; Promote the development of national standards GB / T32655 "Plant growth with LED lighting terms and definitions", the community standard T / CSA 032-2016 "plant lighting with LED lamps general technical specifications" and so on.

Group standard T / CSA 021-2013 "Plant growth with LED flat lamp performance requirements"

Plant growth LED lighting products in many forms, such as flat lights, double-ended lights, flexible lights, etc., and will gradually change with the development of technology. Before and after 2013, LED flat lights are mainly used in tissue culture seedlings. This standard specifies the terms and definitions, classification and naming, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of LED flat lamps for plant growth. Standard content shows the basic indicators of plant growth with LED light source, and living lighting parameters of the difference between the larger.

This standard defines the main radiation wavelength of the LED flat lamp for plant growth. It refers to the red-orange radiation band with wavelength range of 600 ~ 700nm and the blue-violet radiation band of 400 ~ 500nm. Based on this, the blue- (Unit: W), total radiation exposure (unit: W / m2) to support plant growth LED illumination (unit: W), total radiation exposure (unit: W / m2) to support plant growth LED illumination Field of production, testing, acceptance and so on. The standard defines the photosynthetic photon flux density [unit: μmol / (m2 · s)], which refers to the number of photons within a certain wavelength range of light emitted per unit area per unit area during photosynthesis. The number of photons received by photosynthesis is not well measured, and its technical requirements are not reflected in the standard.

The standard for the plant growth LED flat lamp should meet the GB7000 basic safety requirements, the control device in line with GB19510.14, GB / T 24825 requirements, electromagnetic compatibility performance requirements; in terms of electrical characteristics, the provisions of the power, power factor requirements; Radiation performance, the provisions of the initial radiation flux / radiation efficiency, radiation intensity distribution, radiation intensity and red and blue radiation illumination ratio, uniformity of radiation illumination; in the radiation spectral properties, life characteristics, etc. also made a request.

Group standard T / CSA 032-2016 "General technical specification for LED lighting for plant lighting"

The standard focus on LED lighting products, general technical performance and evaluation indicators. As a result of a wide variety of lighting products used in the plant lighting industry, the specifications of different models, performance quality varies greatly, the need to establish a relatively uniform performance indicators of the identification and evaluation criteria. Because this industry belongs to the emerging industry, as soon as possible the introduction of relevant standards, easy to guide the development of industrial technology and product positioning, but because some technical performance evaluation is not mature enough, some parameters (such as photon flux efficiency, light spectral distribution and plant spectrum Degree of division) requirements to be further improved.

This standard complements the term C3 plants, C4 plants, CAM plants, etc., which are classified according to the plant photosynthetic cycle pattern, according to the requirements of the application environment. According to the use of lamps, plant photosynthesis, control of plant lighting with LED lamps were classified. The safety performance, structural appearance, electrical performance (power, power factor), optical performance, reliability and electromagnetic compatibility of LED lamps for plant growth are regulated, and the photon flux efficiency of lamps is graded. The detection method is given.

In the structural appearance requirements, the protection of the surface of the lamp (to WF2), anti-ultraviolet aging made the request; in the optical performance requirements, the provisions of the photon flux, photon flux performance [measured value should not be less than 0.7μmol / (S · W)], spectral distribution, light distribution curve and other parameters; reliability part of the main photon flux maintenance rate, environmental adaptability to do the requirements; in the energy efficiency of the lamp classification, the first corresponding to high pressure sodium lamp [1. 9μmol / (s · W)] and fluorescent lamp [1.3μmol / (s · W)], the photon flux efficiency of LED light source is divided into three categories: one kind [ηP ≥ 1.9μmol (S · W)], the second class [1.3 μmol / (s · W) ≤ ηP <1.9 μmol / (s · W)] and the three types [(0.7 μmol / (s · W) 1.3μmol / (s · W)]. Secondly, according to the degree of the spectral distribution of the light source of the light source at different latitudes can be divided into three categories or three levels, energy efficiency rating of the light source at the same time consider the photon flux efficiency and spectral distribution Of the two factors, the above two factors, will be 3 is divided into three categories like effect altogether nine.

National Standard GB / T 32655-2016 "Glossary and definition of LED lighting for plant growth"

The terms defined in this standard are broadly divided into two parts: one is the content of plant growth, mainly from the terms used in our country's production, teaching and research, which is first developed at home and abroad; the other is related LED products and the detection of terms related to the terms, reference IEC 60050 and GB / T 24826-2016 (IDT IEC62504) standards in some of the terms to ensure the coordination of the standard system. Criteria for confusion in the standard are as follows:

Radiation measurement

(Electromagnetic) radiant energy related terms

In order to describe the performance of the radiation source, radiant energy and related terms are introduced. The radiant energy is defined as the energy emitted or propagated in the form of electromagnetic waves Φe (unit: J) (Fig. 1).

Advances in LED lighting standards for plant growth and system recommendations

The above terms are introduced to describe the nature of the radiation source, in order to describe the time characteristics of the radiation energy to increase the "flux" definition, the radiation flux that is the unit time radiation energy; in order to describe the radiation characteristics of the direction of radiation The radiation intensity is the radiation flux per unit area; the radiation intensity is the radiation flux per unit area of the solid angle. The radiation intensity is the radiation flux per unit area.

The illumination is the radiation received by the illuminance. The irradiance is the radiant flux received per unit area. This is a very important physical quantity, also known as the flux density, for plant illumination. The importance of light to the human eye.