Circuit Load - With addition of LED recessed and cabinet lighting

I'm from Toronto and I not aware of any special considerations for LEDs in relation to code. I am aware of lots of cheap Chinese copys on the market. If your light costs 8 bucks, don't use it. The drivers are crap and brightness varies quite a bit. Even the colour is off a lot of the time. I'm actually writing this in my garage under a very yellow set of 5000k 3" pots that I couldn't use for a customer because I realized they were crap. Each one has a different colour temp. In terms of draw on the circuit, they use almost nothing. Some of them can even be powered with batteries for several hours. Check the draw on your printer if it's a laser sometimes they can draw quite a bit.

TLDR, first the outlet limit is for commercial and industrial locations NOT residential. With that said there is NO way led lighting will over load your existing branch circuits in fact power companies have given huge rebates where I work to replace lighting that was upgraded 7 years ago to fluorescent now again to led's current covering 70% of the fixture cost. You need to look at the wattage of the new lamps a 16w led. Will replace a 100w incandescent if one of the newer lamps this means you could have 5 of these in the same place as a 100w old school incadesent lamp and still use less, in my opinion led lights are brighter and many areas I work including my own home have been upgraded with more perceived light at much less energy usage, in most cases by 1/2 the power with more light because of technology. Not just my opinion but why would power companies pay to do this? Because they don't have to keep upgrading services its a fact. My area my power actually gave me a "free new electric high efficiency water heater but I had to install it. Great deal similar to LED's

Consider having a limited number of DC power supplies that each supply as many lights as possible (remembering that voltage drop is a much bigger issue for low voltage).

Being in Canada you have a statutory limitation on how many outlets you can have on one circuit. (the US doesn't, except for local amendments). The DC power supply counts as one outlet, no matter how many loads it supplies on the DC side.

Another slick thing you can do with DC lighting is fit a deep cycle battery somewhere in the house. Feed the lights from it. Use a proper battery recharger instead of individual power supplies. Now, when the power fails, the lights still work. Along with possibly the Internet router, a few device chargers, some TVs, a Roku box, and the refrigerator if you upsize the system enough and add an inverter*. You can then add solar panels to extend duration during a long outage.

* They used to make special 12V refrigerators specifically for off-grid solar homes, which were hyperinsulated. They were so low volume as to be practically bespoke; so prices were over the moon. Meanwhile, Energy Star happened, and with the benefit of million quantity and therefore a large R&D budget, mainstream builders were able to highly optimize efficiency beyond what a small scale builder could possibly do. So now, even with the efficiency losses of an inverter, plain off-the-shelf refrigerators have proven to be the "way to go".