Osram , Cree and Epistar, which one will you use?
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.
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.