This web page claims that the different frequencies of photosynthetically active light can cause different reactions in plants: https://www.voltlighting.com/grow/best-light-spectrum-plant-...
But I know of plenty of commercial greenhouses that use them prior to shipping to retail.
In a way, you might say that until now, LED grow lighting was only feasible on a very very large scale, or a very small scale, and the medium-sized local nurseries and greenhouses were just out of luck. Cree seems to have changed that.