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UNDERSTANDING LIGHTING ....................

LUMENS

 Forget the days of referring to light bulbs as "40 watt", "60 watt" or "100 watt". The new nomenclature focuses on light output in “lumens”. Light Output/Lumens: Technically, a lumen is a unit of luminous flux derived by measuring the time rate of flow of light. As a point of reference, a traditional 40-watt incandescent light bulb produces a light output of 500 lumens. Energy Used in Watts: Different types of light bulbs use vastly different amounts of energy to produce the same lumens, so an important bit of information is the energy used in watts, i.e. how many units of active electric power are used by a particular light bulb.