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LUX RATING, TOP LUX or LIGHT SENSITIVITY equals the amount of light from a candle calculated from one meter away.

What does this mean in English?  Most B&W cameras have a higher LUX rating then color cameras.  

Bottom line – The higher the LUX the Higher the Clarity you will have at night time or during low lighting conditions.  So, when considering a video surveillance camera system keep in mind the time of day or lighting conditions before you purchase!