Most do require a transformer, and most of those that do it comes in the box, if you intend using a dimmer switch get a set with a dimmable transformer (other wise it won't work) you can get a set of 3 low voltage with dimmable transformer for £9.99.
One other thing, do your self a favour, BEFORE you take your existing lights down, label each wire and make a drawing, it will save lots of problems later
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