LED lamps have been widely used in life and production, and have become the mainstream lamps in the market.
Have you ever felt that the LED lamps are too bright? Or that the LED lamps are too dim?
So, how to adjust the brightness of LED lamps?
There are usually several ways to adjust the brightness of LED lamps:
1. Pulse width modulation (PWM) dimming
By quickly switching the LED, the brightness is adjusted by using the visual persistence phenomenon of the human eye. When the duty cycle of the PWM signal changes, the actual average current of the LED also changes, thereby controlling its brightness. This method does not cause color temperature shift and is highly efficient.
2. Analog dimming
Adjust the DC current flowing through the LED to change its brightness. Reducing the current will reduce the light output, but this method may cause the LED light color to shift at low currents, especially for white light LEDs, which may become warmer (tend to yellow).
3. Digital driver control
Using an LED driver with built-in dimming function, the brightness of the LED can be precisely controlled by programming or external signal sources (such as 0-10V, DALI, DMX512 and other protocols).
4. Resistor dimming
In some simple circuits, the LED current can be fine-tuned by changing the value of the current-limiting resistor, thereby adjusting the brightness, but this is not an efficient way and it is difficult to achieve fine dimming.
5. Smart lighting system
Use wireless technologies (such as Bluetooth, Wi-Fi, Zigbee, etc.) in modern smart home systems to remotely and accurately adjust the brightness through smartphone applications or voice assistants.
6. Dedicated LED dimmer
There is a dimmer designed specifically for LED lights on the market that is compatible with LED lamps and provides a smooth dimming effect.
In summary, most modern LED lamps use PWM dimming and brightness control through corresponding dimming controllers or drivers to ensure high efficiency and good dimming performance.
