As the title states, I’m installing a standard track lighting system on my ceiling. It will be wired directly where a previously existing ceiling fan is located. I want it to be dimmable. My question is in the voltage and how I determine if I need a Magnetic Low Voltage Dimmer or a Electronic Low Voltage Dimmer? Which one will make a humming noise or give spikes in the dimming? Links would be great too. Thanks!

My apartment formerly had traditional track lighting, but now all that’s left is a live end connector sticking out of the wall (not sure if it’s H, J, or L standard); even the track itself is gone. I’m thinking of purchasing Ikea’s "Termosfar" track lighting system to use at the same location but am not sure how to figure out what additional parts will be needed to install the low-voltage Ikea system into the existing infrastructure. Help!

Considering health and safety what is the proper way to replace a single tube without turning off the whole lighting system.