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Lumen - Measurement of a quantity of light as perceived by the human eye.
As a light source's color temperature increases, less light is required to achieve comparable brightness and visual acuity. The international unit to describe the quantity of light (also called luminous flux). ? That is why several manufacturers use this as a standard benchmark for their illumination tools.
Candle Power (Candelas) Used by lighting designers to calculate the foot-candles illuminating a surface (C.P./distance in feet squared) or Lux illuminating a surface (C.P./distance in meters squared)
Foot-candles -Measurement of light output in candela per square foot. It derives from the early English unit of foot-candle defined as the illuminance on a surface placed one foot from the standard candle. 100 foot-candles is generally considered enough light to perform most tasks.
Lux - Measurement of light output in candelas per square meter. One lumen per square. 10 lux is generally considered enough light to perform most tasks.
These terms are useful to assist in determining the "signature" of the illumination tool you are speaking about. No one term will fully describe the overall usefulness or quality of the emission.
For instance, you can have a light with a tremendous candlepower rating at one point in the pattern, but the rest of the pattern in not useful. I.E. dark spots, splotchy, and/or weak.
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