What is Hertz (Hz)

Hertz (Hz) is a unit of frequency used to measure the number of cycles or oscillations per second in a periodic waveform. It is a fundamental unit of measurement in the field of lighting and is essential for understanding the rate at which various phenomena occur.

In the context of lighting, Hertz is commonly used to describe the frequency of alternating current (AC) power supply. In many countries, the standard AC power supply frequency is 50 Hz or 60 Hz, indicating that the current alternates its direction 50 or 60 times per second, respectively. This frequency is important in lighting applications as it can impact the flicker perception of light sources. Higher flicker frequencies, such as those above 100 Hz, are generally less noticeable to the human eye.

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Hertz is also relevant when discussing the frequency of electromagnetic waves, such as light and radar. Different light sources, such as fluorescent lamps or LED lights, may have different frequencies of light emission, which can affect the visual experience and overall quality of lighting. Similarly, in the context of sound, Hertz is used to measure the frequency of sound waves, which can influence the choice of lighting techniques and equipment in architectural lighting design or stage lighting for performances.