|
[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 |
|
Verified Suppliers
|
|
|
Customized Street Advertising 8mm Led Display , Epistar Chip Roadside Led Signs
1. The first level LED chip from Taiwan Epistar.
2. SMD 3535 whilte lamp
3. With pure golden wire connection in LED.
4. Ag alloy solder paster and copper plating thickness > 30mil on 4 layers PCB
5. All new stainless steel screws when assembly.
6. 2 years warranty.
Site: In Dubai indoor application
Site: In Germany outdoor application
LongRun perseveres in carrying on its relentless pursuit if
excellent quality, focused on full color LED display's R&D,
sales and service. It has its products successfully achieved CCC,
CE, FCC, UL etc professional certifications recognized
internationally. On quality control, it implements strictly and
perfectly under ISO 9001:2008 quality certification system. In
daily practices and applications, it emphasizes on 7S management
standards. During producing process, it carries out strict quality
testing on all processes of IQC, IPQC, QC, CFQC, QA and strict
management on supply chain. Until now, LongRun has independently
developed and manufactured a complete range of divercified display
products. They have covered more than 40 countries with over 3,000
success cases in above 10 different application fields including
advertising media, stage entertainment, sports stadiums, urban
lighting, traffic guidelines, financial institutions etc. LongRun's
LED display has own great favor from numerous clients home and
abroad for its high definition, easy installation, smart design,
stable quality etc. 
1.Warranty: 2 years
2.Replacement: 1:1 replacement for defective product
3.Online technicial support: Long distance online technicial support for 12 hours from 8:30am to 8:30pm and from Monday to Saturday.
4.Free training: free training in our factory is welcome and available on working days.
5.Professional advice: all clients could get our professional advice on cases or projects etc.
| 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% |
