# How to control brightness and color temperature for leds with just 2 wires? **URL:** \ **Category:** Questions & Help\ **Created:** [December 30, 2018, 7:07pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111 "2018-12-30T19:07:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Zoezoe](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/zoezoe/32/8386_2.png) [@Zoezoe](https://community.homey.app/u/Zoezoe)\ **Post date:** [December 30, 2018, 7:07pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/1 "2018-12-30T19:07:33Z")
Hi Community! I want to control the leds under my kitchen cabinets. They can be dimmed and the colour temperature can be changed with the current led driver. I would like to control them with Homey, but I don’t really understand how it could be done, since brightness and color temp can be changed with just 2 wires (ww+ and cw+ on the picture). ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/2X/c/c8a5ec0d0bd7f07e931cde16951ed1ff252154ec.jpeg) Could this be achieved with eg. the Fibaro RGBW controller? How would this be done? Thanks for your help ---
**Author:** ![Robin\_van\_Kekem](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/robin_van_kekem/32/8187_2.png) [@Robin\_van\_Kekem](https://community.homey.app/u/Robin_van_Kekem)\ **Post date:** [December 30, 2018, 7:47pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/3 "2018-12-30T19:47:48Z")
> [@Zoezoe](#): > > since brightness and color temp can be changed with just 2 wires (ww+ and cw+ on the picture). ww+ and cw+ are outgoing wires. Control wires are input wires, most of the time. ---
**Author:** ![Caseda](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/caseda/32/138695_2.png) [@Caseda](https://community.homey.app/u/Caseda)\ **Post date:** [December 30, 2018, 8:38pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/4 "2018-12-30T20:38:16Z")
If you know how diodes work the in short it is 2 way biased by changing the power direction. If you don’t, a LED lets the power through only in one way, letting the power go from the `+` to `-` if you swap the + and the - the led won’t light up. So what they do is connect the warm light from WW -\> CW and the cold white CW -\> WW and in the driver they can switch the power direction very fast (also kinda the way they dim a LED, though then they only switch on and off the power very fast) This is not possible with ordinary rgb(w) controllers like the fibaro ---
**Author:** ![Zoezoe](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/zoezoe/32/8386_2.png) [@Zoezoe](https://community.homey.app/u/Zoezoe)\ **Post date:** [December 30, 2018, 9:40pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/5 "2018-12-30T21:40:38Z")
This coincides with my measurements, cw being 12V when the light is cold and ww being -12V when the light is warm. So no easy way to replace this with something zwave/zigbee controllable… or then just for one particular color. ---
**Author:** ![Caseda](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/caseda/32/138695_2.png) [@Caseda](https://community.homey.app/u/Caseda)\ **Post date:** [December 30, 2018, 11:59pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/6 "2018-12-30T23:59:32Z")
With the current strip indeed only 1 color, if you change the strip you can do whatever you want of course ---
**Author:** ![Depeej](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/depeej/32/21924_2.png) [@Depeej](https://community.homey.app/u/Depeej)\ **Post date:** [June 20, 2021, 7:10am UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/7 "2021-06-20T07:10:00Z")
I al facing the same issues. My new kitchen has 3 of these CW WW LED strips build in. They are hard to replace/ remove. I have the exact same L&S controller. The LED strips come with square little connectors at the end of the wires. Is there, 2 years later, a way to connect these type 2 wire LED with a Z-Wave controller in order to connect the LED strips to Homey? Thanks! Pim ---
**Author:** ![Zoezoe](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/zoezoe/32/8386_2.png) [@Zoezoe](https://community.homey.app/u/Zoezoe)\ **Post date:** [June 20, 2021, 8:46pm UTC](https://community.homey.app/t/how-to-control-brightness-and-color-temperature-for-leds-with-just-2-wires/6111/8 "2021-06-20T20:46:03Z")
Hi, I’m not using Homey anymore. But I have a Fibaro RGBW controller to dim my ledstrip. Unfortunately I had to choose one color temperature and can not control that.