I do holiday lighting synced to music. I use either Meanwell power supplies or old server power supplies. The lights at 100% white use 0.6 watts. Because there are so many in one spot, I run them at a max or 30%, or 0.18 watts per light at full white. They are rarely all white so they rarely ever run at that max. But I still use the max consumption in the power calculations out of caution. I also don't go above 80% of the rated power of the power supply. So I only plan on using 290 watts on a 360 watt (12v 30a) power supply. I don't know if that 80% guidance would carry over to poe switches but I've been conditioned to use it so I did when designing my layout and deciding my power needs.