Tuneable White Lighting is the lighting technology that enables changing the correlated colour temperature (CCT) of the white light.

In a lighting application, uniformity is usually the ratio of minimum illuminance value to the average illuminance value on a target surface area (min/avg uniformity).

This is a term used for LED’s to describe the range of their angular output. It is the total cone angle in degrees at which the off-axis intensity falls to 50% of the on-axis peak.

Distance between two points of corresponding phase and is equal to waveform velocity divided by frequency.