My take on this is that a great percentage of solid state lighting will have some degree of
interoperabilty- How the're powered is a non issue( yes varying amounts of energy are used
whether using ZigBee/ WiFi/ even a remote control from your local hardware store) But...
The bigger part of the picture we have for generations wasted kWhrs by leaving lights on or
by over lighting, failing to harvest sunlight etc. Now we have a better way to do the task of lighting.
As sure as brick phones led to phones w/ cameras , then to smart phones - Lighting products(SSL) WILL
evolve into feature packed items- most general lighting will have controls within 5 years!
The sensors from Johnson controls& Schneider draw very little we're talking milliamps,
I plugged in my WiFi airport in to a Wattsup energy meter, its using 3.7 watts.
That can be considered a range for 2 representative control systems that are
common. Bear In mind that reductions in the amount of watts to run a Led light engine
come down each season( more or less)- So the equation becomes even more favorable-
In summation - not much energy is used for the task. For more detailed info , J- controls.\,
Seimens or Schneiders , website can lead you to product specifications.