Dimming function

A Lesson On Dimming Function of LED Lights

Charpter 1  DC low voltage and AC high voltage dimmable LED lights

The DC low voltage dimmable LED lights, for example those 5V / 12V /24V DC LED lights, like LED flex strips, LED rigid light bars, LED puck lights and so on. Those DC LED lights are Constant voltage LED lights, which means, the working voltage of those lights are fixed. Take the 12V DC LED strip for instant, one 12V DC SMD5050 60LED/Mtr rated in 1.2Amp 14.4Watt LED strip, its working voltage is 12V DC, and need to be powered by 12V DC power source. For 1Mtr, you can use one 12V DC power supply not less than 1.2Amp, 14.4W to power it. If in 5Mtr whose rated power is 14.4Wx5, 1.2Ampx5, you will need to use a 12V DC, 6Amp, 72W power supply to power it.

The AC high voltage dimmable LED lights like LED Bulbs, LED downlights, LED panel lights, LED tubes and so on, those are Constant current LED lights of whose . Those lights usually comes with built-in or external dimmable drivers. Those drivers are constant current in 300mA, 700mA, 900mA… (vary for different lights).

 DC&AC dimmable LED lights

Charpter 2  Different dimming methods

Dimming methods (here we mainly talk two kinds that always come contacts with).

1. PWM dimming

The PWM dimming is mainly for DC low voltage LED lights, it needs to use the PWM LED dimmer & Controller, and use the AC 100-240V to DC 12V power supply to power.

2. TRIAC dimming

The TRIAC dimming is mainly for AC high voltage LED lights. To fit the standard Dimmer Switch, it requires the AC high voltage LED lights to be dimmable (usually comes with a built-in or external dimmable driver). And when this TRIAC required for the DC low voltage LED lights, it involves the usage of Constant Voltage Dimmable LED Power Supply.

Below please find wiring digram for different dimming methods for the DC low voltage and AC high voltage LED lights.

***PWM dimming for DC low voltage LED lights

01

1. AC 100-240V to DC 5V/12V/24V power supply (transformer)

2. DC 5V/12V/24V LED Dimmer/Controller

3. DC 5V/12V/24V dimmable LED lights

***TRIAC dimming for DC low voltage LED lights

02

1. AC 110/220V Dimmer standard type

2. AC 100-240V to DC 5V/12V/24V Constant Voltage Dimmable Power Supply

3. DC 5V/12V/24V dimmable LED lights

***TRIAC dimming for AC high voltage LED lights

03

1. AC 110V/220V Dimmer, standard type

2. AC 110/220V Dimmable LED lights (with built-in or external dimmable driver)