LEDs do have one drawback that does slow down the rollout. That is the fact that they operate on DC voltage. This means that transformers are needed to allow operation in most applications. A couple of issues come to mind.One – product designers that put the switch on the wrong side of the transformer. What good does it do to invent a great lamp using LED bulbs only to have a wall mounted transformer sucking up power when the lamp is off. The switch needs to be between the wall and the transformer. At least until we start to design more DC circuits into our homes.Two – why can’t there be some standards on transformers. If you are anything like me, I’m sure that you have dozens of transformers laying around the house and in the garage. Many of them have long since been orphaned from the device they shipped with. Why can’t there be standards? Why does every phone need to have a different style, every laptop different, every electric can opener? These add to the waste in landfills even more so than the devices they power. They add unnecessary costs. When was the last time you had a transformer go bad?It would be great to see some initiative from the electronic consumer device developers to make transformers common, more efficient and much more effective.