Implementation
Light Distribution Method
Reasonable lighting design is very important to improve the uniformity of illumination, three-dimensional sense, reduce glare and meet the lighting requirements. The lighting effect of the parking lot is very different with different lighting methods. At present, many domestic parking lots use high pole light or semi-high pole light lighting, with few lamps and lanterns, the more prominent problem of such parking lots is that the uniformity of lighting in the whole parking lot is poor, and when there are more vehicles parked, it will form a shading shadow and aggravate its unevenness. In contrast to this is the use of ordinary street lamp poles, lamps and lanterns arranged in more points (relative to the former). Investigation found that such a way to lay lights through a reasonable distribution of lamps and lanterns and targeted consideration of the choice of lamps, in achieving the same illumination as the former, the latter’s illumination uniformity is significantly better, so the site is more convenient to use, people reflect better.
Lamp Selection
HID lights and LED lights are commonly used to choose, LED is a solid-state light source, with a small size, fast response, can be modular combination, the power size can be adjusted at will, DC power supply drive characteristics, for the manufacture of lamps and lanterns to bring great convenience. And in recent years in the government’s support and promotion of the development of the speed is very fast, the price of light sources to reduce faster, to create good conditions for LED applications. And taking into account the requirements of safety, security, feature recognition, checking documents, environmental atmosphere, etc., LED lamps and lanterns are selected in this design. Specific lamp parameters are as follows: lamp light rate of 85% or more, LED lamps and lanterns power factor of 0.95 or more, LED overall luminous efficiency of 100lm / W or more, lamp power efficiency ≥ 85%, LED lamps and lanterns color temperature of 4000K ~ 4500K, color rendering coefficient Ra ≥ 70. service life of 30000 hours or more, lamps and lanterns protection level of IP65 or more. Protection against electric shock category is Ⅰ. Based on the above parameters. LG S13400T29BA CE_LG LED Street Light 126W 4000K Type II luminaire produced by LG is selected for this design.
1. Lighting control mode
Light control and time control are set separately, and manual control switch is set at the same time to adapt to different operation requirements. In the light control mode, the lights are turned off when the natural illumination level reaches 30lx, and turned on when the natural illumination level drops to 80%~50% of 30lx. In time-control mode, use the warp clock controller to control, and reasonably determine the time of switching on and off lights according to the geographical location and seasonal changes.
2. Illuminance calculation value.
3. Using DIALux illuminance software to simulate the above design content to calculate the illuminance results as shown in Figure 2 (unit: Lux).
Average illuminance [lx]: 31; minimum illuminance [lx]: 25; maximum illuminance [lx]: 36.
Minimum illuminance / average illuminance: 0.812.
Minimum illuminance / maximum illuminance: 0.703.
It can be seen that the above design layout can well meet the standard requirements (average illuminance: 31lx﹥30lx, horizontal illuminance uniformity 0.812>0.25), and has good illuminance uniformity.