As far as we have learnt, there are many famous LED chips brands as following:
Nichia, Cree, HP, Toyoda GeseiCo, Toshiba, SDK, Philips Lumileds, luxeon, Smileds, Genelite, Osram, Gelcore, Bridgelux, Seoul, Epivalley and etc. they are foreign brands.
Made in China Mainland, brands are: Silan, AXT, LM, San’An, Epilight and etc.
Make in China TaiWan, brands are: Epistar, Huga, Genesis Photonics, Arima Optoelectronics, AOC and etc.
Osram, Cree and Epistar LED chips are widely used in LED displays. Most LED display companies buy chips or lamps from them. It is forecasted that in 2015 China will produce 70% LED products for the world LED market, China will become the largest LED chip market at the time in the world. It is true that Osram is of top quality and famous, however, the extremely high price scare most customers at present. Cree is of good quality and the price is just OK but a little high in the market, most high grade customers choose Cree. The most common-used brands of LED diode are Epistar made in TaiWan and the quality of these LED chips are judged mainly by 5 criteria, which is brightness, attenuation, color uniformity, viewing angle and stability.
China has the strong technology strength and ability to make good quality LED chips. Chips made in China own very big market share in the world LED products market with good reputation due to high cost performance.
What we are going to do is to make comparisons on the three brands from these three aspects and also the prices respectively. Please note that Cree is the only brand which stabilizes after the first 10000 hours and the attenuation after the first 10000 hours is very minimal.
The brightness (measured by mcd)
|Red lamp||400-600 mcd||400-600 mcd||330-600 mcd|
|Green lamp||1600-2400 mcd||1100-1600 mcd||1200-1700 mcd|
|Blue lamp||300-700 mcd||300-600 mcd||300-650 mcd|
|Whole pixel||2700-4300 mcd||2200-3400 mcd||2450-3450 mcd|
The brightness attenuation after 10000 hours:
|Horizontal||150 degrees||120 degrees||110 degrees|
|Vertical||60 degrees||70 degrees||80 degrees|
These three brands are common-use in the market, many LED lights contain these kinds of LED chips and different chips of them depend on different product price and quality.
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