As modern energy-efficient lighting technologies prolif […]
As modern energy-efficient lighting technologies proliferate in our environment, awareness of their impact on biology and even technology is constantly evolving. The rapid development and assimilation of LED lighting often has no clear standards and may cause the lighting to flicker and cause adverse effects. The Led High bay manufacturer below will discuss why the lights are flashing?
First, why does the LED light source flash?
1. LED light source is a different story. Based on semiconductors, they respond quickly to power changes, while common power systems and drivers can produce excessive flicker.
2. Since the invention of AC (AC) powered light sources, flicker has always existed. A change in the power supply phase produces a correspondingly rapid periodic variation of the emitted optical radiation and the resulting illumination intensity or brightness. Traditional incandescent lighting systems are affected, but the effect is not significant because the filaments are relatively slow to respond to power changes. Other light sources, such as fluorescent tubes or other discharge lamps, have a fast response time, so the observer's changes are more pronounced.
Second, the impact of flicker on us?
1. Flicker affects workplace safety and productivity, a comfortable living space, and based on recent research, our overall health and emotional well-being. For example, from a safety standpoint, the fast-rotating elements present in the operator's field of view appear to move not very quickly or stop due to excessive flicker. From a photobiological point of view, prolonged exposure to excessive scintillation causes neurological problems such as headaches, migraines, and even epilepsy.
2. From a technical point of view, flicker can strongly affect the lighting of digital image capture, especially in TV studios and stadiums. Strict broadcast requirements require the use of an appropriate power system to avoid camera image artifacts, especially at high speeds to capture stroboscopic effects during slow playback.
Third, how to limit flicker?
1. In LED light sources, flicker can be reduced by proper design and power supply filtering, for example by using a larger number of capacitors. Alternatively, a high-frequency voltage converter can be used. With LED dimmers, the light intensity can be adjusted in some ways. As some LCD monitors do, changing from pulse width modulation to current regulation also reduces flicker.
2. Manufacturers use several different technical solutions to limit flicker. However, technically possible things do not always translate into perfect finished products. Changes in power system design can increase size and cost - not always the choice of the manufacturer. The result is a product with flashing characteristics on the market that does not match the expectations of the customer or designer. A device defined as having minimal flicker can be driven by a high frequency that is invisible to the human eye, even without being driven by a television camera. If there are no appropriate measurements and standards, statements such as "no flicker" may be more advertised than quantified attributes.