... 220v/230v/240v 50/60Hz CCC/CE/ROH Switchable power impedance ballast for high-pressure sodium lamp Type:NG100-70Z, NG150 ... fitting,matched with ballast,it can change lamp power according to the pre-set time qutomatically.On lighting,it can switch ... lamp power automatically according to different luminance and using requirements, to save plentiful electricity sources,it's a ...