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Watt: This unit measures the power that is needed for a certain application – for instance you need 100 watts to run a 100 watt light bulb. Technically, this is defined as the amount of Joules per second.

Volts: A unit of measure that expresses how many electrons flow through a given circuit. For example, if you compare this concept to the water in pipes, it is equal to the water pressure, or more specifically, how fast or slow the water is flowing. Generally speaking, the US standard for homes is 110 Volts but in Europe and in South Africa it is 220 volts.

Lumens: These units are used to measure the power of light that is perceived by the human eye. These measurements are intended to gauge the varying sensitivity of the human eye to different wavelengths of light,

Kelvin: This unit is used to measure temperature. In relation to lighting it is the most important number to look at to determine the color of fluorescents and LEDs. The lower the Kelvin temperature the warmer the color of the light, and the higher the temperature the more blue and cool the light is.