1). Lumen(lm)
Lumen is the international(SL)unit of luminous flux, a measure of overall light emitted by a light source.
2). Candela(cd)
Candela is the international(sl) unit of luminuous intensity,a measure of light emitted by a light souce in a particular direction.Any given light source will have different luminous intensities in different direction considered.[candela = lumen/solid angle]

3). LUX(lx)
Lux is the international(SL)unit of illuminance, a measure of light arriving at a surface, 1 lumen per square foot equals 1 footcandle, while 1 lumen per square meter equals 1 lux .[lux = lumen/m2]

4)Color Rendering Index(CR)
Color rendering index ranges from 0-100 ,measures a light source’s ability to reproduce the color of varies objects being lit by reference light source, black body radiator(CRI=100)
5)Design Life Time
Design life time is the average life of lighting product when it is operated at nominal lamp voltage,current and controlled working environment.Actual lamp life will varies because of any different from those rating condition.