Power factor is not a lighting metric specifically related to energy efficiency, but rather a measure of the efficiency of electrical power transmission.

An integrating sphere is a device used to measure the total luminous flux emitted by a light source by capturing and integrating all of the light within its inner surface.

A lux meter is a device specifically designed to measure illuminance levels, which is the amount of light falling on a surface.

For a typical indoor lighting installation, a minimum of 20 measurement points is recommended to ensure a representative sample of the lighting conditions.

All of the mentioned factors, including ambient temperature, relative humidity, and measurement device calibration, can impact the accuracy of lighting measurements.

A reference light source is used to calibrate the measurement device, ensuring that it is providing accurate readings.

Visual inspection is not a reliable method for verifying energy savings from lighting retrofits, as it does not provide quantitative data on energy consumption.

Energy-efficient lighting measurement and verification aims to achieve all of the mentioned goals: ensuring design specifications are met, quantifying energy savings, and identifying further efficiency opportunities.

Ignoring the effects of daylight can lead to inaccurate lighting measurements, as daylight can contribute to the overall illuminance levels.

Color rendering index (CRI) is the term used to describe the ability of a light source to accurately render colors compared to a reference light source.

Incandescent lamps are not considered energy-efficient lighting technology due to their low luminous efficacy and high energy consumption.

Luminous flux is the term used to describe the total amount of light emitted by a light source in all directions.

Dimmers are not typically used as part of lighting control systems specifically for energy efficiency, as they do not automatically adjust lighting levels based on occupancy or daylight availability.

Luminous efficacy is the term used to describe the ratio of the light output of a light source to the power it consumes, expressed in lumens per watt.

Return on investment (ROI) is not a direct metric for evaluating the energy efficiency of a lighting system, but rather a financial measure of the profitability of an investment.