Monthly Archives: December 2016

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


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


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


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

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


RGBW IC 5050-144_7

A lesson on RGB LED light strips and accessories

For the Christmas comes so near, people have beginning to think about decorate their houses for a beautiful and warm winter.

Recently I was asked for what LED lights are good to use for decorating the frame of their houses.Those frequent inquiries make me have this idea to sort out all what I know here to help someone out.

Chapter 1 RGB Multi-color changing LED strip

The RGB Multi-color changing LED strips which also known as 5050 RGB LED strips, those strips are made by SMD5050 RGB LED. This 5050 RGB LED has 3 chips inside, R(red), G(green), B(blue), so when work with compatible LED controller, it can mix to produce multi colors and white color.


Those strips are usually available in 12V or 24V DC, with different LED density, we can get SMD5050-150 per 5Meter, SMD5050-300LED per 5Meter and SMD5050-600LED per 5Meter.

The RGB color strips need to work with compatible RGB LED controller to change the strip color or dim the brightness. There is a vast of LED controllers. From mounting or controlling method, you can have Manual controller, IR or RF wireless RGB controller, Wall Recessed Touch Panel RGB Controller, WIFI smart APP LED Controller and DMX512 controller and so on.

The 12V and 24V DC strip are made 5 meter (16.4ft) per roll the max because if too long a continous run, the voltage drop will cause the back end of the strip dim which make the whole roll strip give bad light consistency. When one project that involves in many rolls of strips and need to control by one single controller, you can use RGB Amplifier , and power each roll of the strip in parallel to make it.

For example, below is a wiring diagram for a project that 25meters of the RGB LED Strips.

(p.s. This is just one way to run, you can run the amplifier after the strip’s tail too.)


Note: When you use the DMX512 controller to control the RGB strip, you need to use the RGB DMX decoder to transfer the SMD512 signal to the one that the LED strip can get. In theory, you can use countless decoder after one DMX512 controller which means with one Master Controller, you can control as many rolls of RGB as possible. Please find below wiring diagram for reference.


In the real installation, you may need to cut the strip to different lengths, or get the strip turning at corner, or have two strips install with a long distance. In those conditions, you will need to use RGB strip connectors, RGB cables. Also you will need different power supplies to fit different cases (wall plug-in type, hard wire type, waterproof type, etc).

Charpter 2 RGBW/RGBWW Multi-color changing LED Strips

In charpter 1 we said that the RGB 5050 LED has 3 chips (R, G, B) inside, so when it mixes to produce different colors, regretfully it can only mix to get cold white color. And as this white color is mixed by R, G, B, so it’s not so pure. In this condition, the RGBW 4in1 5050 LED comes out. This RGBW 5050 LED just as its name it has 4 chips inside, they are R, G, B and W (white). And as t he white color temperature is available for 3000K warm white, 4000K natural white, and 6000K pure white (daylight white), so the RGBW can be devided into RGBW (RGB+pure white), RGBNW( RGB+natural white) and RGBWW (RGB+warm white).


There are various choices for RGBW LED controllers to fit your different needs. You can recesse the Touch Panel RGBW controller into wall which is inline with your whole decorative style. And you can use wireless remote controller or WIIF Smart APP controller to save wires and look chic.

The same as RGB LED strips, when installation, you should pay attention to the voltage drop problem. If many rolls in a project, need to use RGBW Amplifiers. And when you use DMX512 controller for the RGBW strips, please don’t forget to use RGBW decoders. And also need to use 5 leads RGBW strip connectors and 5 color lead cable.


Charpter 3  Magic/Dream color IC controlled Addressable RGB LED strips and IC controlled Adressable RGBW LED strips

The RGBW LED strip get the non-pure white light problem solved. But human’s imangination and creativity is amazing. Besides just give some static simple color or simple flash, jump of color changing, what about to have more magic colors and more complicated dymamic lighting modes. Or what’s more to DIY something that can play more complicated moves, like words or videos. Come to this stage, we have the Addressable RGB LED strips and Addressable RGBW LED strips.

图片5 图片6

The Addressable RGB and RGBW strips are made with IC added on the strips. There are many types of IC, like WS2812, UCS1903, SK6812, TM2812, and so on. When select controller for the Addressable strip, please make sure the controller can use for the strips’ IC type.

The Addressable RGB and RGBW strip are available in 5V DC and 12V DC. The 5V DC strip is individually addressable. It means the strip is every 1 LED is a pixel point be controlled by 1 IC, and every 1 LED can be cut. In turn the 12V DC strips is every 3LED as a pixel point be controlled by 1 IC and every 3LED per section can be cut. The more pixel points of the strips, when you use the strip to make screen to play words or video, the higher resolution the images or video will have. So the 5V DC Addressable strips has more pixel points than the 12V DC Addressable strips. But the 5V DC strip limits by the voltage drop factor, the length for each roll will be shorter. For example, the RGBW addressable LED strip has 5V 5050 30LED/M model in 4M/roll, 5V 5050 60LED/M model in 4M/roll, and 5V 5050 144LED/M model in 2M/roll.

The RGB Addressable LED Strip and RGBW Addressable LED strip should work with matched IC LED controllers. For RGB and RGBWW strips, they uses different LED controllers. Usually one controller will make to compatible with many IC types, please check it before place the order. And one controller will have its max controlling pixel point limit, during installation, it’s better to set up the controlling pixel point data to its max.

For example, if the pixel points of the RGB Addressable strips controlled by one dream color LED controller exceed the controller’s max rate, need to add data repeaters. And you can consider to use DMX512 controller and DMX Data decoder.


More information on the Addressable LED Strips, I will sort out in another post.










Waterproof IP67 Power Supply

Fully Potted Waterproof IP67 LED Power Supply for Outdoor or Underwater Use

When install your LED light in hard ambient condition, like outdoor, by pool side, the LED strips light can be made into waterproof directly. And to avoid too far away from the LED lights to the 12 V power supply, which too long distance there is voltage drop cause lights dim, we suggest to put the power supply close to the LED lights. In this case, those waterproof IP67 LED power supplies will solve your concerns. This fully potted IP67 waterproof power supply can also put underwater less than 2 meters deep. Very reliable products.



Waterproof IP67 Power Supply