Epi-Wafer Market to Grow to $4 Billion in 2020 as LED Lighting Zooms to $80 Billion BOSTON, MA--(Marketwired - Jul 18, 2013) - As LED lighting becomes an $80 billion industry, the market for the epitaxial wafers (epi-wafers) LEDs are made from will grow to $4 billion in 2020,...