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[China]
Trade Verify
Address: Building C/D,longrun industrial area ,NO.1001-3 Xihuan Road Shangxing West Industrial Park, Shajing street,Bao'an District,Shenzhen,China
Contact name:Joyce
Shenzhen Longrun LED Optelectronic CO.,LTD |
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Verified Suppliers
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Waterproof Outdoor Fixed LED Display , P8 Video Wireless Led Display Board
√ High color contrast and consistency, high brightness to ensure good display result.
√ CNC technology for cabinet, flatness between cabinet units <0.2mm.
√ Energy saving and noiseless power supply, excellent heat dissipation to ensure good stability and life span.
√ Constant current drive, lumiance decrease <5% per year.
Shenzhen Longrun LED Optelectronic CO.,LTD, a professional LED display manufacturer engaging in R&D, manufacture and sales,which started its business since 2009. Its factories locate in Huazhan Science & Technology Industrial Park, West Shangxin Industrial Park, which are neotype high standard industrial parks in Baoan, Shenzhen. Two production bases are conjunct with each other, cover an area of 12000 square meters, total register capital reach 10 million RMB. Being one of the domestic leading suppliers inLED product application and solution, Longrun has separate purification plant, R&D base, and the industry’s most advanced automated production and testing equipment. It dedicates in providing terminal clients with LED applications of high quality and performance and also with the most effective service.
| Q: What is the brightness, viewing angle and wavelength of the LED? |
| A: Luminous Intensity is equal to the amount of luminous flux
emitted into a very small solid angle at a defined angular
orientation from the light source. The measurement for luminous
intensity is the candela. Symbol is Iv. Viewing Angle is the total cone angle in degrees encompassing the central, high luminous intensity portion of the LED beam from the on-axis peak to the off-axis point where the LED intensity is 50% of the on-axis intensity. This off-axis point is known as theta one-half ( 1/2). Two times 1/2 is the LEDs' full viewing angle; however, light is visible beyond the1/2 point. Wavelength is the distance between two points of corresponding phase and is equal to waveform velocity divided by frequency. It defines what color human eyes could recognize |
| Q: What is dominant wavelength? Please specify the ranges of wavelength in red, green and blue color respectively. |
| A: Dominant wavelength is defined as the best range of wavelength showing the most natural color recognized by human eyes. Researches indicate that fixed colors with wavelength of 620-630nm (red), 520-530nm (green) and 460-470nm (blue), in fact mixed in a particular proportion, can get the pure white. That is, in display field, people use luminous materials with above wavelength to make "compounded" white more natural.In order to get a good balance white led display, we specify the led colors with wavelength within 4nm for each color |
| Q: Which chip vendors are you buying from? |
| A: It depends on the Customer's requirement. We can purchase from Japan, Korea, Europe, USA. We are using chips mainly from Taiwan |
| Q: What is the chip size you're using for outdoor display? How about indoor display? |
| A: For outdoor display, we're using 12mil chip for red, 14mil for both green and blue. Regarding indoor display, 9mil for red, 12mil for green and blue are currently adopted |
| Q: How much will the brightness of LED drop down after 1000hrs? |
| A: Based on the result of aging test, the brightness decay of green LED is around 5%-8%, while blue is around 10%-14% and red is around 5%-8% |
