High power LED is heading toward higher brightness and lower cost year by year. Ever since the invention of LED, its luminance increased by 30 fold while its cost decreased by 10 fold every 10 years, developing quickly toward becoming a high power, high light efficiency and low cost light source. Currently, the brightness of high power WLED in laboratory research can reach 100Lm/W and those which shines with 60Lm/W has already been put into commercial use in the market. ... 閱讀全文