The GaN power device industry has probably generated less than $2.5M revenues in 2011, as only 2 companies (IRF & EPC Corp.) are selling products on the open market. However, the overall GaN activity has seen extra revenues as R&D contracts, qualification tests and sampling for qualified customers was extremely buoyant.

http://www.news10.com/story/17735484/power-gan-2012?clienttype=printable