The market for residential lighting design in San Francisco's upper tier has quietly professionalized in a way that would have seemed extravagant even to the extravagant. AI-powered fixtures now learn a household's rhythms — dimming ahead of a dinner party, brightening in the morning by a few kelvin at a time — and the people who program and tune them have developed a specialist's vocabulary to match: circadian protocols, lumen layering, adaptive warm-white transitions. The homes these systems land in are largely concentrated in Pacific Heights, Sea Cliff, and the newer high-floor condos stacking up along the waterfront, where asking prices already assume a buyer who considers lighting an infrastructure question rather than a decorating one.

The consultants in this space are careful to frame the work as wellness, not decor. Exposure to the wrong light spectrum at the wrong hour disrupts sleep, they'll tell you, citing published research that does, in fact, support the broad point. Whether that research supports a $250,000 installation is a different conversation, and most practitioners seem uninterested in having it.