How to Size Low Voltage Transformers for LED Under Cabinet Lights

 

 

We stock a full line of low voltage transformers for your LED under cabinet lighting projects. You will find all of them here.

LED Products which operate at 12 or 24VDC will not dim with your household dimmers. We have special low voltage dimmers here. You will use the same method to calculate dimmer size as described below for selecting your transformer.

To size your transformer, simply add up the mA consumption of the product you are purchasing to arrive at a total consumption in Amps or milliamps and de-rate that total by 20%.

Example: The Xtreme LED Under Cabinet Lights (model XLLB 3) on this page consume 200mA each. The model XLLB 5 LED Under Cabinet Lights on the same page consume 420mA each.

If you were going to use 6 XLLB3's and 6 XLLB5's, you would have:

6 x 200 mA = 1200 mA

6 x 420 mA = 2520 mA

Total: 3720 mA

Our smallest transformer, the TX-1A has 1000 mA (1 Amp) total capacity. De-rated by 20%, it has a 800mA max current load. That would be too small for your project.

Look down the transformer page until you find a transformer of adequate size.

The TX 5-A has a maximum load of 4000mA You could use that transformer. However, it is never good to push a transformer to it's maximum load.

The suggested transformer for your project would be our A PS-100 or larger if you think you may expand your LED lighting project in the future.

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