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    UFO lights design scheme

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    Yaorong lighting system design requirements

     

    Factory lighting must meet the needs of production and inspection. The lighting system of the factory is usually divided into two categories: tall factory buildings and general factory buildings. For tall workshops above 15m in height, gas discharge lamps are used as light sources for general lighting, and lamps with narrow beams (such as deep-illuminated factory lamps) are hoisted on the bottom string of the roof truss. Floodlights can be set on the walls and columns, and the two can be combined to ensure the required illuminance on the work surface. In general factory buildings, fluorescent lamps can be used as the main light source, and the arrangement of lamps can be perpendicular to or parallel to the beam. Factory lighting should follow the following general principles for design. 

     

     

    1•The choice of lighting method 

     

    (1) The requirements for illuminance are high, and the working position density is not high. Mixed lighting should be used in places where general lighting alone is unreasonable.

    (2) When the illuminance requirements for the operation are not high, or when limited by the production technical conditions, it is not suitable to install local lighting, or the use of mixed lighting is unreasonable, general lighting should be used alone. 

     

    (3) Zonal general lighting can be used when a certain work area needs higher illuminance than general lighting.

     

    (4) When the general lighting of the district cannot meet the illumination requirements, local lighting should be added. 

     

    (5) Only local lighting should be installed in the work area. 

     

    2. Illuminance standard The illuminance value of the factory lighting design should be selected according to the national standard GB5003-2004 "Architectural Lighting Design Standard". This standard specifies the illuminance value of general lighting for sixteen major industrial buildings. The illuminance standards of the more specific workplaces of various factories should also be based on the relevant industry's.

     

     

    3•Lighting quality is a sign that measures the pros and cons of factory lighting design. It mainly includes the following contents:

     

    (1) Choose lamps with high efficiency and suitable light distribution curve. According to the hanging height of the lamps on the frame of the factory building, the lamps with different light distributions are selected according to the RI value of the room shape index. When RI=0.5~0.8, narrow light distribution lamps should be used; when RI=0.8~1.65, medium light distribution lamps should be used; when RI=1.65~5, models 100W/150W/200W/240W/wide Light distribution lamps.

     

    (2) Choose a lighting source with appropriate color temperature and color rendering index that meets the production requirements.

     

    (3) Reach the specified uniformity of illuminance: the uniformity of general illumination in the work area should not be less than 0.7, and the uniformity of illuminance in the vicinity of the work area should not be less than 0.5. 

     

    (4) Meet the quality requirements of the direct glare limit of lighting: unified glare value (UGR according to GB5003-2004. That is, the general allowable value is 22, and the fine processing value is 19. 

     

    (5) Take measures to reduce voltage fluctuations and voltage flicker Impact on lighting and prevention of stroboscopic effects.

     

    (6) The lighting device should work under the allowable working voltage, and compensation capacitors should be used in places where metal halide lamps and high-pressure sodium lamps are used to improve its power factor. 

     

     

    4. Light source selection The light source should be selected according to the characteristics and requirements of the production process. The lighting source should be a three-primary thin tube straight tube fluorescent lamp, a metal halide lamp or a high pressure sodium lamp. When the light source is 4m or less from the ground, a thin tube fluorescent lamp should be used; higher height Factory buildings (above 6m) can use metal halide lamps, and high-pressure sodium lamps without color rendering requirements. Incandescent lamps can be used in the following places for factory lighting:

     

    Places with strict requirements for preventing electromagnetic interference.

    Places with frequent lights on and off.

    Places with low illuminance requirements and short lighting time.

     

    Local lighting and places where lighting is temporarily used. High-color-rendering three-primary fluorescent lamps should be used in places that require strict color identification (such as spectral analysis rooms, chemical laboratories, etc.).

     

    Lamp selection Lamps and lanterns for factory lighting should be selected according to environmental conditions, meeting working and production conditions, and paying attention to beautiful appearance, easy installation and coordination with buildings, so as to be technically and economically reasonable.

     

    Calculate according to the plan. Factory lighting design often uses the coefficient method to calculate the illuminance. For a certain point on the horizontal plane, vertical plane or inclined plane of some special places or special equipment, when the illuminance value needs to be calculated, the point-by-point method can be used for calculation.

     

    Laying method of factory lighting circuit Factory lighting branch line generally adopts the method of laying insulators (or porcelain pillars) with insulated wires along (or across) the roof truss. When the large-span plant roof structure adopts the grid type, in addition to the above methods, insulated wires or cables can be laid along the grid through steel pipes. The lighting lines of explosion and fire hazard workshops generally use copper core insulated wires to pass through water gas steel pipes.

     

    In places affected by chemical corrosive substances (acid, alkali, salt spray), hard plastic pipes can be used for laying. According to specific conditions, knotting or special lighting bus can also be used for hoisting and laying in some places.

     

     

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