This product is the Varilight YT50LZ low voltage lighting transformer with trailing leads, designed for 0-50VA and suitable for 12V AC LED lights with a maximum of 25W. The transformer can control 12V AC LED lights with a total load not exceeding 25W. If you want to dim the lights, combine the LED values to determine the load and ensure that the chosen dimmer has a low enough minimum load rating. For the best dimming performance with LEDs, it is recommended to use Varilight V-Pro or V-Com dimmers.