LighTech LVT-303 Electrical Transformer, 24V 300W Electronic Dimmable The dimmable LVT 303 24Volts/300Watts LighTech electronic low voltage halogen lighting transformer can be dimmed by low cost TRIAC dimmers without producing any acoustic noise, which is a common problem for other electronic transformers The most compatible dimmers for these low voltage transformers are "trailing edge" or "reverse phase" wall dimmers which are commonly called electronic low voltage dimmers UL and cUL listed