Solid-state illumination accounted for 7 percent of the market, or ＄320 million, in 2007, and this figure is expected to grow to nearly ＄1.37 billion by 2012.

The solid state may the long time preservation, the ferruginous vessel maintain to the soybean isoflavones activeness advantageous, the long time illumination urges the isoflavones activeness weaken.