Responsive Sustainable - New Choice for Energy-saving Lighting in Construction Sites

1. Lighting safety requirements at the construction site of a construction site

1.1 The construction lighting supply voltage shall meet the following requirements:

a) In general locations, the lighting voltage should be 220V.

b) The lighting voltage should not exceed 36V for tunnels, civil defense projects, high temperature, conductive dust and narrow places.

c) The lighting voltage should not exceed 24V for wet and easy-to-reach lighting circuit locations.

d) The lighting voltage shall not be greater than 12V in a particularly wet, well-conducted ground, boiler or metal container.

e) The line lamp voltage should not exceed 36V.

1.2 On-site lighting circuits must use soft rubber sheathed cables and be equipped with leakage protectors. The metal shell of the lamp should be grounded (zero) protected.

1.3 The phase line of the lighting should be controlled by the switch and the phase line must not be directly introduced.

1.4 The “one machine and one brake” system must be implemented. It is forbidden to use the same switch to directly control two or more electrical equipment (including sockets).

1.5 Overhead lines must be insulated copper or insulated aluminum wire.

1.6 The metal bracket of the mobile iodine tungsten lamp should have a reliable ground (zero), and the height of the lamp from the ground should not be less than 2.5m.

1.7 High pressure xenon lamp mounting bracket should be solid and reliable, and must have rainproof measures.

1.8 Construction Lighting Outdoor lighting fixtures shall not be less than 3m away from the ground and indoor lighting fixtures shall not be less than 2.5m above the ground.

1.9 Construction Lighting Use 220V iodine tungsten lamp should be fixed and installed, its height should not be less than 3m, inflammables must not be less than 500mm, and it must not directly illuminate flammable materials, and it must not use 220V iodine tungsten lamp as mobile lighting.

1.10 The form and degree of protection of construction lighting fixtures should be compatible with the environmental conditions.

1.11 In places where night or dark construction is required, emergency lighting power sources must be provided.

1.12 Red warning lighting must be provided at night for construction sites, facilities and equipment that may affect pedestrians, vehicles, airplanes and other safe passage.

2. Construction Site Energy Consumption Overview

At present, the construction site lighting on the construction site is mainly divided into ambient lighting and local work lighting at the construction site. The lamps and lanterns mainly use xenon lamps, high pressure sodium lamps, metal halide lamps, iodine tungsten lamps, and common incandescent lamps and energy-saving lamps.

Most of the power of xenon lamp, high pressure sodium lamp or metal halide lamp is between 1000W and 4000W. When there is construction requirement at night, it is understandable to ensure sufficient illumination, but when there is no construction work at night, the purpose of turning on the lamp is only for safety needs. Once it is turned on, It will generally work all night. This type of light source does not have the dimming feature, it will be very wasteful.

Iodine tungsten lamp power is generally 500W ~ 1000W, because the area of ​​local operations are mostly below 10m2, because this type of lamp is a diffuse type lighting fixture, the lamp surface temperature is high, the potential safety hazards. In addition, the light efficiency is low and the irradiation area is large, resulting in very serious waste.

3, energy-saving measures

By contrasting the effects of various lighting sources on-site lighting, we have adopted a LED tower chandelier instead of a high-power Xenon lamp under the premise of ensuring lighting safety in the construction site lighting management, with flexible control and significant energy saving.

LED light source has the following advantages:

a) Green and environmental protection: The monochromaticity is good, the LED spectrum is concentrated, there is no extra infrared, ultraviolet and other spectra, heat, radiation is very little, and there is little impact on the objects to be photographed. And mercury-free hazardous substances, waste can be recycled, no pollution.

b) strong directionality: flat light, strong directionality. It is different from point light source incandescent lamps, viewing angle ≤ 120 °.

c) Fast response: The response time is short, only 60ns, the start is very fast; incandescent lamps or metal halide lamps are on the order of milliseconds; high pressure sodium or metal halide lamps often take 1 to 2 minutes to fully start.

d) Low voltage: The driving voltage is low, the working voltage is DC, and it is safe.

e) Small size: Small size and light weight. The use of its characteristics can be designed thin, light, and compact all kinds of lamps; backlight products.

f) Multi-color: The LED is colorful and colorful. Different semiconductor materials, different colors of light. The color saturation reaches 130% and the combination of different colors of different colors changes. With the use of the timing control circuit, rich dynamic effects can be achieved.

g) The control is convenient: as long as the current is adjusted, it can be dimmed at will to make the light more clear and soft to make people feel more comfortable.

3.2 light source selection

a) Ambient lighting at the construction site, using multiple sets of LED sub-control intelligent light sources to replace high-pressure sodium or metal halide lamps;

b) Indoor lighting in the construction site, using multiple low-power low-voltage lighting products to replace metal halide lamps;

c) Construction and living areas, low voltage LED lighting products.

From this it can be seen that only 147.19 million kWh of electricity can be saved in only one year. If the electricity cost per kWh is 1.1 yuan, the electricity cost can be reduced by 163,000 yuan per year, and electricity savings can only be used for about six months. Can recover the investment of LED lamps, and then the overall LED lamp life is greater than 50,000 hours, which means that at least can be used for more than 10 years, from the LED light source and sodium light source comparison, the entire light source life cycle calculation is not only save money and energy saving also environmental protection . Moreover, the light source has flexible control, and the power of each LED lighting device is small. When there is work at night, the light source can work at all times. When there is no work, some light sources or half power work can be turned off to achieve the energy saving purpose of on-site lighting of the construction site.

PS: The above statement shows that LED lamps have functions such as energy saving, environmental protection and power saving.

According to our understanding, there are still many construction sites in China that use high-power Xenon lamps, high-pressure sodium lamps, metal halide lamps, or iodine tungsten lamps for on-site construction lighting. It is understandable at night if it is not in operation. Security, because the above light source power is larger, the power is not adjustable, it will cause a great deal of power waste.