LUMEN:
■ noun
Unit for measuring the rate at which light is transmitted (Optics); unit of light energy;
Cavity, hollow space (Anatomy, Botany) ;
eg.In buying the bulbs,she checked not only their power,but also their brightness ,which is measured in lumen.
LUXURIANT:
■ adj. abundant; rich; fertile, growing; magnificent; richly ornamented
eg. Within a few short years, brown eroded hills have replaced luxuriant forests in many parts of the country.