I didn't really understand the motivation for a 100W LED that runs off AC mains. As for AC, I am generally quite scared by it but my very first maker project, some 40 years ago, was a nightlight, that every kid made in shop class (it's a resin-encased vacuum fluorescent light and a resistor connected to AC blades!) And I also played with vacuum tubes, converting AC to DC on a protoboard. After a bit I decided to stop doing that, as it's a true shock hazard./