The LED (light emitting diode) is a semiconductor diode, also an electronic component, and was developed several decades ago. However, as a lamp, as we know and use, it is only a few years in the market and is constantly evolving.
Here are, briefly, the most important facts in simple term.
1 What is an LED?
A semiconduct can pass current in one direction only. If the current flows in the forward direction, it emits light radiation.
2 What kinds of LEDs (chips) are there?
SMD (Surface Mounted Device): The LED is soldered directly to the PCB. The advantage over traditional wired LED lies in better heat dissipation and less space.
COB (Chip on Board): The LED is applied directly to the substrate, thus an "onboard" solution. The advantage is even higher packing density and a more homogeneous light output compared with SMD chips, since the individual points of light are almost not visible.
3 What to buy? SMD or COB?
At the moment there are very good products on the market with SMD chips that have already gotten through several years of test runs. Apart from that, they are cheaper than COB chip. And we prefer SMD LED.
4 LED lifespan
The wildest rumors of up to 100,000 hours are being told here. Theoretically, these operation hours are possible, but it usually fails especially in low-priced products mostly electronics (LED chip and power supply) and bad temperature management.
Realistically, branded products have up to 50,000 hours of operation. The difference to conventional lamps is that LEDs lose luminosity much more slowly with the growing number of operating hours. For example, 50,000 hours of operation, this means that the LED is still owns 70% of its original brightness. Conventional HQL lamp loses luminosity after about 2000 hours massively.
One should imagine something like this like a flashlight, when the battery starts to weaken slowly. In the LED technology we use terms like lumen depreciation or degradation.
In 90% of cases for the failure are responsible electronics or poor thermal dissipation.
5 What are the differences to cheap LED lights?
Here is hidden of the most important factors. It is through the bad experience from end users in recent years, that the customer was made very insecure and also disappointed with short lifetime of LED products. As with many technical devices, especially different radiator, LED Chip, power supply, PCB, thermally conductive silicone and process technology.
Our industrial lights have already been used successfully several times in wide application areas and have a failure rate of less than 0.01%. Especially in commercial LED range the saying "Who buys cheap, buys twice" is true 100%.
6 What is LED light efficient?
Generally what we mean by efficiency is the ratio of luminous flux (lm) to the employed performance in watts (W). We called it Lm/W. This aspect plays a big role in the current LED technology, because more lumen output but less power consumption.
7 What is LED light illumination intensity?
Pay attention to the fact that it makes a huge difference whether is reflector is used, or an optic to concentrate light. Any type of reflector unnecessarily consumes power, so you have to pay the electricity bill without any equivalents gain.
8 Is it enough that 150W LED high bay to replace of 400W metal halide?
Yes. Our 150W LED high bay meets or exceeds that of 400W metal halide high bay fixtures.
9 What about input voltage of led high bay?
Standard input voltage is 100~277V AC, but 347V or 480V high bay is welcome.
10 Are you going to have high bays that are controllable?
1-10V Dimming, Dali Control, Microwave motion sensor control and ZigBee control is available.
11 What is the maximum mounting height for the led High bays?
There is no set height. It depends on the geometry of the room and what lighting levels are needed. IES recommends approximately 30fc for most working areas.
12 What is the operating temperature range for the high bay?
The high bay is designed to run between -20℃ and 50℃.
13 What is ambient temperature of LED Fixtures?
The LM79 tests are performed at 25℃ +/-1℃ which is standard. The fixtures are rated for -20C to 50C (-4oF and 122oF).
14 Is the cover over the LEDs glass or plastic?
Tempered glass or PC cover is standard. It ensures these LED are not damaged.
15 What does it mean by 60 Degrees beam angle? How to measure it? And do you have lights with larger degrees?
60degrees refers to the emitting angle of beams. You can put the light on a flat surface, turn it on then you can measure its angle easily. But it is inaccurate to observe with naked eyes. The smaller the angle is, the more condensed the light is. Generally, the angle of lamp is 30°,45°, 60°, 90° and 120°.
A good LED light with help of quality optics as directly as possible (calibrated beam angle) , to bring it where it is needed. So the product choice reveals itself through logic through consideration of the construction method and area of application.
16 What about installation way and installation accessories?
Our led light includes different installation way, such as lifting by hook or rings, surface mounted by metal bracket. Any customized installation is welcome too.
17 What about luminous efficiency of lamp fixture?
Our led light with above 100Lm/w at least, and Diamond LED High Bay with above 145Lm/w. Anyway, more lumen efficiency is available, please contact with our sales.
18 What about plug and cables?
Any plug and cable is available, according to different country’s regulation.
19 What is warranty policy?
Standard products offer 5 Years warranty guarantee. If some failure happened, we will work with you on repair and maintenance, then help you on claim procedure. Find the the problem, solve it!
20 Over the past five years, what percentage of failure products?