Haven’t seen any activity toward duplicating daylight. They seem to want a certain K, like a 6500K “cool white” or a 2700K “warm white”.
They could do a much better job of duplicating daylight if they wanted to, with mixing phosphors or something, but they don’t really care about that yet. it wouldn’t be too hard.
Philips has a bulb that has the phosphors on the inside, another company is developing a modular system that allows a change in the phosphor disc, for a warmer or cooler white. presumably any combination of phosphors could work. The most efficient led light is the 470nm blue currently, and it’s the efficient 470nm blue chip lighting the phosphors and creating the white.
I was thinking more in terms of when they get the light panels down cheap.
Light panels on the ceiling, walls and ceiling simulating daylight and shadows at different times of the day, light panels in closets and kitchen cabinets etc.
Besides, any serious attempt to “duplicate daylight” as known inside a typical home would mean creating a window or skylight that doubles as a lamp at night. Luminescent window shades maybe?