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### Topic: Power Supply for TV Ambilight setup - 5M WS2811 5050 RGB LED  (Read 299 times)previous topic - next topic

##### Jan 19, 2019, 09:10 pm

Hi, I want to put 12V WS2811 5050 RGB LED strips behind my 65" TV, and use a Arduino Nano and the Android Ambilight aplication on a Nvidia Shield to make a Ambilight setup..  But i need some help calculating the Power Supply and have some questions.

My setup will be like this:

LED from Ebay: WS2811 5050 RGB LED Strip 1m/5M 150 300Leds Addressable (1IC 3leds ) DC12V
https://www.ebay.com/itm/332814411686

Android Ambilight aplication:
http://ambilight.tender-complex.ru/en/

TV: 65" : 65" (H:1M  L:1,32M) .. Total 4,64M around the TV..

Power Supply estimate:
4.6M*60 LED per Meter: 276 LED total..  276 LED* 0.3W per LED = 82.2W Total   82.2W/12V = 6,85A

Power Supply Minimum: 12V, 90W, 7A . . Does that look correct?

Question1: My LED strips has 1 IC per 3 LED.  Should i count the IC`s or the LEDs when i calculate the Power?

Question2: Is it enough to power the LEDs just on the front and back? or do i have to split up the LED strip and power at every corner to get the full color effect?  How can i calculate the resistance in the strip?

Thank you, this is both my first Arduino and my first LED project, so hopefully somone can give me some pointes

#### Grumpy_Mike

#1
##### Jan 19, 2019, 10:37 pm
Quote
Question1: My LED strips has 1 IC per 3 LED.  Should i count the IC`s or the LEDs when i calculate the Power?
Count the chips not the LEDs, because three LEDs are in series. Also calculate the current not the power in watts.

Yes power the strips in each corner.

Quote
How can i calculate the resistance in the strip?
You can't because LEDs are not linear and as such don't have a fixed resistance. The effective resistance changes with current so it is a meaningless figure.

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