Most of the LED light strips I see are either 12V or 24V, which require a driver to step down the power from 120v at the wall (thus the little black transformers that come with them). However... I only recently discovered they come in 120V with a small in-line rectifier, AND they can be run over 150ft without a voltage drop in a single strip.
Aside from cost, why bother with the 12V and 24V route with the wiring when you can simply hook up the 120V directly to a dimmer switch in the wall (with a built in rectifier of course)?
I'm new to the LED light strip world, but am I missing something when it comes to why most people go with the 12V and 24V version?
Minor clarification edit for my application: I'm looking to use a long run LED lighting setup in crown molding around a living room, and it greatly simplifies things with a single run as opposed to several power supplies to driving about 100 feet of lighting. But I'm new to this kind of lighting, so willing to learn something new)