Is this the next big thing.

Save more power, less installation costs.

A simple cat 5 cable to power and control your lighting, sure seems like a good idea.

Step back and we need to set some boundaries.

Who specifies the installation of the lighting, it is no longer in the realms of electrical engineers. Is it now your IT provider, who may have no knowledge of lighting principles. What happens if the system goes wrong?

Will we get lots of cat 5 cables slung over a suspended ceiling, who installs the cables for suspended fittings, Do we get better Cat 5 cables for exterior use.

The idea of Ethernet Lighting is sound. Lets do the ground work first and get the right things in place.

But that's only my opinion