Ketra
Light that tracks the sun indoors.
What they're known for
Full-spectrum tunable LEDs that shift through the day like daylight — circadian lighting at the fixture level.
Ketra builds light that behaves like the sky. The S38 lamp and Linear fixtures run full-spectrum tunable LEDs that emulate natural light across the day — warm and low in the morning, bright and blue-rich at noon, amber by evening — automatically, at the fixture level, in whatever fixtures the designer specified.
Most "circadian" lighting is a dimmer preset wearing a lab coat. Ketra actually changes spectral output, which is what your eyes respond to, and it's why the brand (now part of the Lutron family) is the default spec in serious circadian builds. Luxury-tier pricing, but it's the real version of the thing everyone else approximates.
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