Several key parameters that must be taken into account when selecting LED chips

With the declining cost of LEDs and the ever-increasing energy efficiency, large-scale adoption of LED lighting is about to come, and LED lighting has become the hottest topic for the industry. Because the design of LED lamps involves many technologies such as optics, thermals, microelectronics, etc. Usually LED designers pay more attention to the design factors of the appearance, heat dissipation, and driving circuit of the lamps, while ignoring the selection of LED chips.

At the 2011 International LED Innovation Forum at the Shanghai Electronics Fair in Munich, Zhou Xuejun, Marketing Director of Asia, Philips Lumileds, gave a keynote speech titled "Development of LED Technology for Lighting Applications." Zhou Xuejun shared the LED products of Philips Lumileds in this speech. The view of the key parameters of the LED chip is believed to be very helpful for LED lighting designers.

Zhou Xuejun revealed that Philips Lumileds has already shipped more than 1 billion high-power LED chips, and accumulated 15000 hours of measured data. There are also 700 million hours of test data accumulation. These accumulations are for LED lighting designers. Very valuable experience.

“As LED energy efficiency continues to increase and costs continue to decline, LED chips have begun a price war. At this time, in addition to cost considerations, many other key parameters, such as reliability indicators, should also be considered when selecting a type,” Zhou Xuejun pointed out.

He believes that the three major indicators of LED reliability should be:

1, the lumen maintenance rate - there is no lumen maintenance, will lead to the same batch of LED lamps brightness is not the same, so engineers must learn to look at this indicator curve.

2, the color stability, he suggested that you can access the manufacturer's LM-80 report to obtain relevant information.

3, to examine the reliability of the supplier's supply chain - if it can not be delivered promptly, it will cause your order to fly!

In addition, he also pointed out that to examine the light quality of LED, the three major elements of this light quality are consistency, no difference and color rendering, which is crucial for stable and reliable LED lamps.

In addition, he revealed that there is a two-dimensional code on the back of Philips Lumileds' latest generation LUXEON3LED product. When you read this QR code, you can get a lot of information on the chip such as manufacturing date, MOVCD information, etc., which also facilitates the maintenance of LED lamps. .