Feeling one: There are so many standards that you need to learn to use it.
All sports lighting standards are broadly divided into: national or industry standards, standards developed by international sports organizations, several standards of the International Lighting Commission CIE, and international broadcaster standards. For sports buildings of different purposes, the standards for their implementation are different; for the same sports buildings, different levels of competition are held, and the standards for lighting are different. The standard is divided into product standard and application standard. The product standard determines whether the product is qualified, can meet the requirements of the product index, and can determine whether it can be shipped. Application standards determine whether the product can be used and where it is used. Therefore, the two types of standards are related and relatively independent.
Impression 2: Lighting energy saving is an eternal topic, and it is also the goal that the company will always pursue!
In the latest "Code for Electrical Design of Sports Buildings" JGJ 354-2014, the overall requirements for energy-saving applications of sports lighting are proposed. The illuminance power density value of the site lighting unit of Class B and above sports buildings should meet the relevant requirements (see table below). Therefore, no matter which manufacturer's lamp is used, no matter what control system is used, it should meet the standard energy saving.
Site lighting unit illumination power density value
Basic requirements for TV broadcasters: high illumination, high uniformity, suitable color temperature and color rendering, and low glare. In order to achieve energy-saving effects, sports lighting should select the appropriate color temperature and color rendering light source according to the level of the stadium. When the requirements of the lighting index can be met, a high-power light source should be used.
Feeling three: the improvement of the efficiency of the lamps is endless! For the lighting manufacturers, improving the lighting effect is the goal pursued.
Based on the fact that the current luminaire efficiency has been improved, the recently issued "Electrical Design Code for Sports Buildings" JGJ 354-2014, 2009 edition "National Civil Construction Engineering Design Technical Measures Electric" has made higher requirements for luminaire efficiency, namely " Metal halide lamps should not be used with open luminaires, and the luminaire efficiency should not be less than 70%â€.
Impression 4: The temporary lighting system has a broad market and is widely used in sports events.
In the stadium, the permanent lighting system refers to the long-term sports lighting system equipped in sports buildings and sports facilities. Temporary lighting system is a temporary use of the site lighting system that is provided during the sports meeting without the provision of permanent motion lighting system or permanent lighting system that does not meet the requirements. It will be withdrawn after the sports meeting. Supplementary lighting: When the permanent lighting system does not meet the requirements of the competition, the lighting system used to increase the illumination of the site to meet the requirements of the venue lighting will be removed after the sports meeting, and the lighting system will be restored to the original permanent lighting system.
Sense 5: Controversy over the chromaticity parameters of the source – from controversy to research.
The chromaticity parameter of the light source has caused controversy in the application of sports lighting. The controversy lies in the significant change in the recommended value of the artificial lighting parameters of the stadium broadcasted by FIFA. Looking at the changes in the illumination standard of the football field, the color rendering index and color temperature have changed a lot, and there is a great shock in the industry. (As shown below)
Changes in the illumination standard of the football field
In fact, the new standards for venue lighting in the world, not only FIFA, international network, CIE, professional sports broadcasters have similar trends, need to closely watch the industry, may also bring new driving force to enterprises, new products Innovation.
Sixth impression: the degree of protection of the luminaire.
"Sports Hall Lighting Design and Testing Standards" JGJ 157-2007 proposed that metal halide lamps should not be used with open lamps. The degree of protection of the lamp enclosure shall not be lower than IP55. The degree of protection shall not be lower than IP65 in places where maintenance or pollution is not convenient.
The "Code for Electrical Design of Sports Buildings" JGJ 354-2014 proposes that metal halide lamps should not use open-type lamps, and the efficiency of lamps should not be lower than 70%. The protection level of the lamp housing should not be lower than IP55, and the protection level of the lamp housing should not be lower than IP65 in places where maintenance or pollution is inconvenient, and the protection level of the underwater lamp housing should be IP68.
The products developed according to the requirements of the specification meet the market demand, and the driving force of the standard can be seen!
Feeling seven: The power supply device for metal halide lamps - a new product that nobody cares about.
Metal halide lamps have very important characteristics. After a power failure, it needs to be cooled for a certain period of time before it can be lit. It takes a certain time for lighting to reach the rated light output. The specific EPS requirements that can meet the requirements during the sports broadcast are as follows:
1. The characteristics of EPS should be compatible with the starting characteristics, overload characteristics, light output characteristics and arc-extinguishing characteristics of metal halide lamps;
2, EPS should use online devices;
3. The overload capacity of the EPS inverter should meet the requirements;
EPS inverter overload capability
4, EPS should have good voltage regulation characteristics, and its output voltage should comply with the provisions of Section 3.5.2 of JGJ 354-2014 of Electrical Design Code for Sports Buildings;
5, EPS power supply time should not be less than 10min;
6. The capacity of EPS should not be less than 2 times the maximum calculation capacity of the load;
7. The power supply system of EPS should adopt TN-S or partial IT system;
8, EPS overload protection, over temperature protection, harmonic protection and other additional protection should be applied to the signal, should not be used to disconnect the power supply.
Impression 8: How to not change the aiming angle of the lamp during maintenance?
The "Code for Electrical Design of Sports Buildings" JGJ 354-2014 stipulates that the way the luminaire is opened should ensure that its aiming angle is not changed during maintenance. Light fixtures installed in high altitudes should be lightweight, small in size and low in wind load factor. For sports buildings of Class C and below, when there are other maintenance measures and can ensure that the aiming point of the lamp is not changed during maintenance, there is no way. Lifting lamps are an effective measure, and interested manufacturers can develop such products!
Feeling nine: Can you develop a lamp with a voltage regulation function?
The voltage has a large effect on the metal halide light output, the voltage is reduced by 10%, and the illumination is reduced by about 20%; the reverse is also true. The "Code for Electrical Design of Sports Buildings" JGJ 354-2014 proposes that the allowable values ​​of voltage deviation at the terminals of lighting fixtures in the venue should meet the following requirements: First, special grade and Grade A sports buildings should be ± 2%; second, Grade B And the following levels of sports buildings should be ± 5%. Interested manufacturers can develop lamps with voltage regulation.
Impression 10: Actively develop the system and strive to create a new road - underwater lighting system.
Diving pools, swimming pools, paddling pools, surf pools and the like, including warm-up pools in swimming pools and relaxation pools for diving, which allow people to enter, and people in the water will increase the risk of electric shock due to the decline of human body resistance. In underwater lighting equipment, the insulation is susceptible to moisture or water ingress, causing leakage, and the risk of electric shock to personnel is greatly increased. Therefore, underwater lighting equipment in these places should use lamps with class III protection. Underwater lighting in these locations requires a Safety Extra Low Voltage (SELV) system with a nominal voltage of no more than 12V. The power supply needs to be placed outside Zone 2. Can manufacturers develop and integrate underwater lighting systems from a system perspective?
Impressions 11: Two important parameters that must be paid attention to in the LED era - R9 and strobe ratio.
Sports lighting has gradually entered the LED era. In addition to the eight color samples used to calculate the general color rendering index, CIE also provides six color samples for calculating special color rendering indexes, including red, yellow, and green with higher chroma. , blue, European and American young women's skin color and leaf green. China's light source color evaluation method has additionally increased the standard color of Chinese youth women's skin color. The special color rendering index is the color rendering index of the 9th to 15th standard color samples selected by the International Commission on Illumination (CIE).
Ri = 100 – 4.6ΔE (wherein: Ri is the special color rendering index; ΔE: the color difference of this color sample under the reference source and under the source to be tested.)
LED sports lighting can't get around R9, which is still to be studied. Preliminary results: When there is a TV broadcast, R9>0; HDTV broadcast, R9>20.
The stroboscopic effect of LEDs is worthy of attention. The first method of stroboscopic effect is the stroboscopic ratio. At a certain frequency, the difference between the maximum and minimum values ​​of the output luminous flux is greater than the sum of the maximum and minimum values ​​of the output luminous flux, expressed as a percentage.
The second assessment method is the stroboscopic index: the ratio of the portion A1 above the light output average to the total light output (A1+A2). FI=A1/(A1+A2)
Its value is from 0 to 1.0.
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