Jeez this stuff drives me nuts. My understanding is that some transformers step it down to 12V AC and others to 12V DC. Half of the ads for transformers don't specify if the output voltage is AC or DC. I mean please, why isn't something that important specified?

Am I ignorant here? I mean there is of course a difference between 12V AC and 12V DC isn't there?

For example, this ad doesn't specify:

https://www.amazon.com/Watt-120V-Voltage-Ballast-KTET-75-1-SCP-DIM-HV-AL/dp/B004VW6Y4O/ref=sr_1_4?s=movies-tv&ie=UTF8&qid=1483222128&sr=8-4&keywords=12+volt+step+down+transformer

This one does:

https://www.amazon.com/150-Watt-Transformer-Halogen-BSET150/dp/B00905TLLU/ref=sr_1_1?s=movies-tv&ie=UTF8&qid=1483222851&sr=8-1&keywords=12+volt+step+down+transformer

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