A number of years ago, there was a push by many Leftish technocrats for the government to mandate a standardized cell phone power cord. Beyond demonstrating that there is no personal irritation too trivial for some to demand government action, this would have been an awful idea. Why? Because when these demands for action came, cell phone power cords were just that, power. If a standard cord had been mandated, then current designs that use a USB connection for both data and power would have been illegal, at least without the vendor also putting in a connection for the government standard connector as well. There is always danger to the government setting arbitrary standards, but these dangers are an order of magnitude higher when the technology is still in flux.
So enter light bulbs. The government has decided to ban incandescent light bulbs and while not mandating them, it has actively encouraged people to purchase expensive CFL bulbs. The only problem is that CFL bulbs suck. The light from them has bad color qualities, many take a long time to warm up, they are hard to dim, and they contain toxic substances. They also have nothing like the multi-year life we are promised. I have tried CFL bulbs of many, many brands and none have consistently achieved their promised life.
But as much as I hate CFL's, I am coming to love LED-based lights. LED lights use even less energy than CFL's and last a really long time. The technology allows for color tweaking better than CFL's, and already the warm white LED's I am buying (color temperatures around 2900K) are better to my eye than CFL's, and there is no fast-flicker problem that gives some people headaches. Dimable versions are coming out, and prices are dropping but they are still expensive. About half my house is LED now, and I am told that landscape lighting is quickly going all LED.
The main cost to LED's is that they all have to have a transformer. LED's run at low voltages, like 5v, so house current has to be stepped down at every bulb. LED's in theory should run cool and be cheap, but they are expensive and run hot because of the transformers.
Which leads me to wonder whether we may start wiring houses for 12v in parallel to 110v. When I grew up, nearly everything I plugged into the wall -- lights, motors, appliances -- ran on 110V. Now, most everything (other than appliances) that I plug in the wall actually needs 5-12v (computers, cell phones, all my audio equipment except big amps). I don't know enough about power lines to know if this is feasible. I am pretty sure the resistance losses for 12V DC would be too high, so it would have to be 12V AC, but a diode bridge and some capacitors is a hell of a lot smaller and cheaper than a full blown transformer. I know my landscape lighting has long runs of 12V, that seems to work OK. It is also a hell of a lot safer to work with.