For most people with solar, surplus energy gets fed back into the grid. So, from a policy point of view it kind of makes sense to not allow people to use ineff

For most people with solar, surplus energy gets fed back into the grid. So, from a policy point of view it kind of makes sense to not allow people to use inefficient lights, even if they're running a surplus. Inefficient lights can consume a lot of energy. Have you looked at metal halide lights? They require specialized ballasts, so they aren't exactly a drop-in replacement for a standard bulb. The light quality is said to be pretty good, similar to incandescents, but they're more energy-efficient. I have an unfinished project to make an indoor artificial sun (basically, some bright lights projected through lenses to create parallel rays), which is how I started looking at metal halide lamps.