At present, the application of LED in the field of lighting is advancing by leaps and bounds. The two records of light efficiency and price “bottom line†have been constantly refreshed. China has played an important role in this global wave. Its huge market size has quickly become the focus of the LED industry chain. As a tourist destination, Hangzhou is also a natural city that LED can't refuse.
First, LED lights in Hangzhou city
Application in lighting
Hangzhou is a famous tourist city in China and abroad. As an extension of tourism space and time, the night scene lighting began to be built in 1990. With the advancement of lighting technology, the materials of Hangzhou city lighting are constantly changing. In recent years, LED has rapidly moved into the field of lighting. Hangzhou has used LED products extensively in landscape lighting and functional lighting.
Application of LED in Hangzhou Landscape Lighting
Landscape lighting refers to the intuitive feeling of an environmental or environmental element at night. The professional description should be the shaping and construction of the light space. There are usually two ways to express a landscape element with light. One is “remodeling†and the other is “reproductionâ€.
LED lighting "remodeling" elements
The "remodeling" method is to decorate and embellish the elements, basically relying on the "brightness" of the lamps themselves to make the elements show different effects from the daytime. The "remodeling" method requires very low light efficiency for LED lamps, and only requires a certain surface brightness. Such as outline the building, decorate the building wall and so on. According to the creativity of professional designers, Hangzhou has a large number of single buildings using LED lamps, such as the Oriental Haosen Hotel, Chenghuang Pavilion, Agricultural Development Building, and Peace Building.
The LEDs used here are actually familiar LEDs, but with the introduction of new concepts of LED and semiconductor lighting, semiconductor lighting has entered the field of lighting, occupying a high proportion of domestic LED products, giving full play to its low voltage safety and low power consumption. The advantage of low maintenance costs.
LED lighting "reproduction" elements
Such LED chips must be high-efficiency products. According to the experience, when the chip efficacy is greater than 60lm/W, the encapsulated LED can meet the minimum requirements of the “reproduction†element.
Case 1: In 2005, there was a serious shortage of electricity in Hangzhou. In order to meet the public's request for the opening of the fountain in the Wulin Square in the city center, the municipal government agreed to carry out energy-saving renovation of the Wulin Square fountain, and changed the original PAR lamps to LED water. Under the spotlight. Under the same lamp volume, the PAR lamp has 50W, while the LED lamp has only about 10W. The PAR light flux is greater than 1500 lm. Considering the light loss of the luminaire, the luminous flux of the illuminating port of the luminaire should be about 700 lm. Therefore, the luminous efficacy of the LED is required to be 70 lm/W, and the luminous efficacy of the chip is greater than 90 lm/W. Since there were very few LED lamps with true high luminous flux at that time, LED products with a luminous efficacy of about 50 lm/W were selected, resulting in a decrease in the brightness of the fountain. In order to compensate for the brightness problem, after adding several metal halide lamps underwater, the effect basically reached the design requirements, and the total power consumption was reduced by 70%. This case shows that domestic high-efficiency LED lamps are very rare.
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