Nick Holonyak Jr., the earliest inventor of LED, was just an ordinary researcher at General Electric Company (GE, also known as Strange) in the United States, and created the first red LED. Low brightness, only for indicator light. A small number of high-cost, high-brightness LED technologies are not yet available for lighting.
The 2014 Nobel Prize in Physics was awarded to three Japanese scientists (Shuji Nakamura et al.) for their work on blue leds. The invention of blue leds, which are super bright, will be able to be used for lighting.
At present, most of the LED lights are the light emitted by the mixture of blue chip yellow phosphor, and there are also color lights mixed with red, green and blue light. It is said that the white LED without phosphor has come out and has not yet seen the commodity.