LED Lighting Terms

Lumens are units of luminous flux that show how much light a light source emits per unit time. It measures

What Is Lumen Depreciation? The simple definition of lumen depreciation is the gradual reduction in lumen output in any particular

Lighting uniformity is defined as the ratio of minimum to average illumination on a given surface (Emin/Eav). If the illumination

What Is Color Shift? Color shift is a variation from the initial color that occurs on the LED chip. This

What Is PPE? The ratio of the produced PPF to the applied electrical power in watts is a common way

What Is DLI? DLI measures the total daily light input received by a plant. Though scientists would likely argue that

What Is PPFD? PPFD measures the PPF that reaches a particular area (m2) on a given surface, represented in μmol/m2/s.

What Is PPF? PPF—the fundamental unit of electromagnetic energy—measures how much PAR a light source emits in a second. Furthermore,

What Is PAR? PAR is the abbreviation for photosynthetic active radiation, which includes the visible wavelength of light from 400nm