There are different LED powers, different sizes, different characteristics. Depending on the application and desired results, they can be used for a type of product or another, or combined.
We will not use the same LED for a flash of a smartphone or for street lighting.
All LEDs are not equal in quality and performance. There are many LED manufacturers offering very low quality LEDs which might call into question the credibility and maturity of LED technology.
Novaday chose to use in its products LEDS only produced by the best manufacturers in the world : Nichia, Cree, Philips Lumileds, Sharp .....