A semiconduct can pass current in one direction only. If the current flows in the forward direction, it emits light radiation.

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.

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. 

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.

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%. 

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.

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.

Yes. Our 150W LED high bay meets or exceeds that of 400W metal halide high bay fixtures.