LED light China not only have many advantages than other lights but also have different brightness measurement from other lights. We all know that wattage can be used to express the brightness of lighting fixtures especially incandescent lights. The watt is a derived unit of power in the International System of Units (SI), named after the Scottish engineer James Watt (1736–1819). The unit defined as one joule per second, measures the rate of energy conversion or transfer. Almost everyone had once seen different wattage incandescent lights like 15 watt, 30 watt and 100 watt etc, the higher the brighter. However when lighting products like CFL and LEDs appeared, watt can not express brightness as accurate as before. For example: a 75 Watt incandescent bulb, 18 watt CFL and a 9 watt LED may all produce the same amount of usable light.

The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total “amount” of visible light emitted by a source. On 1 September 2010, European Union legislation came into force mandating that lighting equipment must be labeled primarily in terms of lumens, instead of watts of electricity consumed. This change is a result of the EU’s Eco-design Directive for Energy-using Products (EuP). For example, according to the European Union standard, an energy-efficient bulb that claims to be the equivalent of a 60 W tungsten bulb must have a minimum light output of 700-750 lumens.

In addition there are other measurements that can be used.