Below are some commonly -used terms which you may come across when discussing lighting products:
LED - Light-emitting diode, a semiconductor which emits light when a current passes through it
Watt – a watt (W), named after Scottish inventor James Watt, is the SI unit of power and is the rate of energy transfer. It is equal to one joule per second.
Lumen – a lumen (lm) is the S.I unit of luminous flux, and is the measure of visible light emitted, and is roughly equivalent to the light emitted from a standard wax candle
S.I. - "Système international", the international system of units