The price mystery of the COB led light

In the current market cob light, high-end products can be sold for more than 1 per watt price range of ordinary products distributed in about 5-6 hair, while some of Zhongshan COB light source can even reach 3-4 hairs "limit price" market situation so mixed, but we as consumers in choosing when to buy lighting products, must want to know the cost of the spread where?
The survey interviewed by reporters in common COB lighting products, with their proportion of the share price of the sort order: 1 chip; 2, gold wire; 3, glue; 4 bracket. In addition, the substrate material is accounted for part of the price of COB light source can not be ignored.

Articles in this issue because of limited space, to which a higher proportion of temporary chip and the industry to discuss higher frequency gold wire material factors determine the cost of the production process, do a simple discussion. As for the glue, brackets and board, etc., follow-up reports will be filled. Hopes to be able to initiate the series of articles, and readers together to uncover the mystery spreads COB light source.

Although the led street light wholesale after years of development, but still can not change the fact that - the chip is still accounted for the bulk of the price of light. Reporter survey showed that the current chip accounted for over half the cost of the light source, even nearly 70 individual. Meanwhile, with the domestic chip quality generally improved, it has been able to replace imported chips in some areas.

"At present, our production is domestic chip-based lighting products, but in some special series also used the Taiwan-based manufacturer of chips imported chips and domestic chip compared to the price will be higher, generally more expensive to 10- 20 points. "photoelectric Co., Ltd. Shenzhen Crystal Taiwan strategic research director Zhang Lei told reporters.

"In the current market, in wide circulation COB products, for example, we use the 1734 models of wafer chip that circulate in the market unit price of about 135 yuan / K. Under the same size, the same luminous efficiency of the situation, homemade chips, its price is about 90-100 yuan / K. "Crescent photoelectric Co., general manager of Shenzhen Zou Yiming told reporters.

Meanwhile, the reporter learned through visits, although cheaper than homemade chips imported chips, but that does not mean it will be in the product parameters down to leeward. In some areas, imported chips in performance even further than domestic chip.

"Take the example of domestic Sanan chips from our test results that, it's no better than small and medium-power chip Epistar of Taiwan to be worse, but in terms of power, maturity compared to the Taiwan-based chip, which is slightly lacking from the situation we had the use of domestic high-power chips seems there are a lot of customers to reflect, it still can not achieve product stability as wafer level of such imports Puri chip. "Lei said that the current crystal sets photoelectric small power sources to domestic Saman, Huacan chip-based, while the premise of high-power light source aspects and customer requirements, they will adopt the imported chips.

In addition, the reporter also learned that the current in the LED chip industry, there are also differences square pieces with raw footage, which also contributed to the emergence of a post currently source products are the main factors.
"For example, the same brand of chips in the production process will be a positive band and partial-band products, we make white light source, and more will use blue band between 450nm-460nm, but some manufacturers will buy some partial band products, such as for example, or some high voltage and the presence of leakage risks chip 445nm-450nm this band for production. "Zouyi Ming said under normal circumstances, these chips are not in accordance with the normal price to purchase, but at most half the price of regular chips.

Gold is currently in light industry, the line is divided into two: one is pure gold wire; the other is the alloy wire. From the current market distribution, circulation area east and south China with more gold or high gold-based, but the wire is not a small proportion still exists. For example, known for cheap route known Lighting Capital - Zhongshan, companies will be using most of its light alloy wire, the printing of gold wire has been difficult to see.

"If the gold standard of 1.0, a single volume 500m length measurement method to measure the current 25μm in diameter gold wire price of about 1000 yuan from top to bottom, and with lower gold content, its price will gradually decline, for example, 60% of the content alloy wire, its price will be around $ 600.

Next is a silver-based high content silver alloy wire, its price is about in the range of 100-300 per month, and then followed by the unit price of 50-60 dollars of copper, which is currently the most expensive synthetic lines. "Silicon Technology Co., Ltd. Sigma director Yin tree Yuan told reporters, gold wire and synthetic gold, the price gap between the cost of different materials is extremely huge.

In addition, led street lighting fixture also learned that the current gold wire diameter is divided into 25μm, 27μm, 28μm, 30μm in four different sizes. Its different diameters at different construction costs also reflect the same time, it also exists for the product quality and a certain degree of influence.

"Obviously, the finer the gold wire diameter, its price will be lower because the LED light source at work, it is extremely high heat, while it goes out, the temperature would drop dramatically due to thermal expansion and contraction principle, the diameter is too low, the tension is not strong, then it is likely to cause the emergence of Weld, disconnection and other conditions, which leads to problems with the overall quality of light. "Zou Yiming, said, 25μm 28μm compared with pure gold wire specifications, it's 300-400 yuan price will be cheaper, but the product stability considerations, the industry in terms of COB devices still use more 28μm diameter gold wire.