This dataset captures 10 published patent families filed between 2015 and the 2026 data cut-off, drawn from a search combining human-centric, circadian and tunable white lighting terms with tunable-LED and phosphor-converted-LED claim language. That is a small, tightly scoped set rather than a comprehensive count of every lighting patent that touches circadian effects. Broader searches without the specific IPC and claim-text filters would return a larger number, but with much lower precision.

By citation count, US20200098732A1, titled Tunable white lighting systems, leads this set with 18 citations — far ahead of the next records, which sit at 2 each. High citation count generally reflects how long a filing has been visible in the corpus rather than a measure of its current commercial reach, so it should be read as an influence signal, not a validity or enforceability signal. Any competitive review in this space should still start by checking claims against this filing specifically.

No — filing peaked at 5 families in 2021 and had dropped to 2 by 2022, the flat-to-declining pattern in this dataset. Because publication typically lags filing by around 18 months, the 2025 and 2026 figures are likely undercounted rather than a genuine collapse in activity. Even accounting for that lag, there is no visible upward trend comparable to the 2021 peak.

US11296058B2, assigned to JUGANU, LTD. and granted 2022-04-05, claims a lighting device with a circuit board carrying an LED array that emits broad-spectrum light across a range of colour-correlated-temperature values, built from a narrow-spectrum LED paired with a different broad-spectrum LED, with at least one elastomer encapsulating part of the board and array. The elastomer encapsulation is a distinct physical limitation alongside the spectral-tuning claims, meaning a design-around focused purely on driver electronics would not necessarily avoid it. Anyone building a multi-channel tunable white product should read this claim set in full before finalising a chip-and-package architecture.

The IPC composition shows H01L and H05B carrying the bulk of claim density, while A61M, C09K and H10H each appear in only one record — pointing to phosphor material composition, biomedical light-delivery integration, and light-emitting semiconductor structure variants as under-claimed branches. That said, single-record classes in a ten-family dataset could reflect either real white space or gaps in this specific search's indexing, so a targeted secondary search of those classes is worth running before relying on the gap. Academic filers, notably the Shri Ramdeobaba College cluster, are already active in adjacent claim territory, which is a useful signal of where interest is forming even without commercial filings yet.