Tagged with 'Energy-efficient lighting design'

Luminous efficacy measures how effectively a light source produces visible light. With LEDs and other light sources, luminous efficacy is the ratio of luminous flux to electrical power, known as lumens per watt (lm/w). For example, the light output (luminous flux) of a 1 Watt LED can be very bright for high efficacy or barely visible for low.

The luminous efficacy is one of the defining factors of LED performance. Top performance LEDs, with the highest luminous efficacy, have 220 lumens per watt (lm/w), such as the Nichia 757G LEDs. High performance LEDs, like those from many other manufacturers, have 150-200 lm/w. At the far end, we have the low cost, poor performance LEDs with an efficiency of less than 99 lumens per watt.

The ABCs of energy efficiency

A lighting installation can be energy efficient in three ways:

A) The light is emitted with the lowest possible energy consumption.

B) The total light output of the installation is at an optimum, as defined by its purpose or the activities it needs to support.

C) The composition of the white light is on tune with the sensitivity of our eyes.

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