A good whole-home lighting system sets the mood, cuts your energy use, and should last for over a decade if you pick the right ecosystem. You are buying once to avoid ripping out incompatible switches and bulbs in two years.
Tech brands usually refresh their dimmer switches and hubs in the fall, which means you can often grab last year's proven model at a discount right before the holidays. Look for clearance stock on older bridges before you pay full price for the latest stamp.
That 0% window is a hard deadline, not free money, and any balance left when it ends will get hit with standard interest rates.