A. Technical service:
Providing whole technical scheme for customer's project: According to customer's request , we provide whole technical scheme for their project in the whole system of solar street light project, including choice of processing techniques, equipment , as well as raw material composition and quality control advice.

B. Training:
Before delivery, our workers must test the whole ready products without any malfunctions and provide training for customers about the content of installation manual, trail run, operation and maintaining as well as relevant processing technology support. If our customer need, we can supply the related video.

C. After-sales service for customer:
Our experts team is all the time keeping in touch with customer over the world , providing service for commissioning and site-training .

D. Spare parts supplying:
We are supplying any spare parts for:
Solar street light system , such as electrical wire for lamp pole, controller, special electric power supply to assure the properly operation and installation.
PV power supply system, such as the necessary controller and other related parts.

E. FQA Service:

What is an LED?
LED is the common abbreviation for a light-emitting diode. Each individual LED consists of a semiconductor diode that emits light when a voltage is applied to it. The electronics industry has used LED technologyfor several decades as indicator lights for various electronic devices. In more recent years, LED technology has progressed to the point where it is viable for general lighting applications.

Where have LEDs been used in the lighting industry?
LEDs are commonly used in aesthetic, effect, or specialty lighting applications, including architectural highlighting. Most traffic lights and exit signs, for example, now use red, green or blue LEDs.

Have LEDs always been used in general illumination lighting?
No. Early attempts to apply LEDs in general illumination lighting failed because they didn't meet the lumen-per-watt output or color requirements. Technology has advanced to the point where using LEDs for general illumination is now successful. Lighting industry experts are gaining a better understanding of how to capitalize on that technology.

What are the advantages to using LED lights?
LEDs bring several advantages to the lighting industry, including high efficiency and durability, and, with superior life over other lamp sources, their required maintenance is greatly reduced. This translates into energy savings, maintenance savings and an overall reduction in cost of ownership over the product's lifetime.

What's the difference between efficiency and efficacy?
Efficacy is a term normally used in cases where the input and output units differ. In lighting, we are concerned with the amount of light (in lumens) produced by a certain amount of electricity (in watts). On the other hand, efficiency is a term that is typically dimensionless. For example, lighting fixture efficiency is the ratio of the total lumens exiting the fixture to the total lumens initially produced by the light source.

How are LEDs able to outperform HID?
Super-bright white LEDs have the advantage of minimal lumen depreciation, better optical efficiency and high lumens per watt. LEDs also have a vastly longer life span than traditional lamp sources.

The luminaire must be designed to leverage these inherent advantages of LEDs. A Total Systems Approach is needed for an LED product to bring all these features together.

Liu Yuan Brand also have an environmental advantage in that they contain no mercury, are RoHS compliant, last longer and produce less waste. In fact, 20 to 25% (by weight) of the product is made using post-consumer recycled materials (aluminum castings and extrusions). Furthermore, 70% (by weight) of LED fixtures are readily recyclable. The remaining LED circuit boards, drivers, wires and connectors are all non-hazardous, mercury-free, and RoHS compliant.

If an LED fixture has lower initial lumen output than a traditional HID light, how can LED claim to deliver lumens more efficiently than HID? When you average delivered lumens over the course of 60,000 hours, you'll see that LED outperforms a 400-watt MH lamp operated in a horizontal position. (60,000 hours is used for this comparison to show three full life cycles of the HID.)