Why so many LED PCB manufacturers in China?

If you have a research LED PCB manufacturers in China, you must find the amount of its increase very very fast.
This post will discuss some factors of LED PCB manufacturers high speed developing.

The background of LED PCB manufacturers high speed developing

You know the economy of China has increased very fast in past 30 years.
This situation also happens to the LED PCB industry.
LED stands for Light Emitting Diode and has been around for many years, but only recently generally available as a genuine alternative to traditional light sources.

Second factor is the material developing

All PCB material cost most PCB manufacturers spend.
So the cost of LED PCB material main factor to LED PCB industry developing.
Illumination, for example, aluminum base PCB, copper base PCB, FR4 PCB with different materials, like Bergquist material, Laird material and Taiwan material.
Why so many LED PCB manufacturers in China?