I had the same 5 of transformers ordered to retrofit several lighting units. Unfortunately, one of the transformers has a defect, because the LEDs only flash angeschlosenen. The others work well for 1 week. Let's see if I get one converted. As the purchase took place over MarketPlace and so far I can not not contact the seller because buying in 'My account' does not appear. Demensprechend me now lacks even the bill. I'm curious what will come of it. When the exchange goes well, I will improve the evaluation