Circadian Light is a startup located outside of Boston producing lighting fixtures that purport to offer real circadian rhythm control over blue light spectra.  Looks like they are starting with basic troffers.  I don’t much about them, but they’ve posted a short video that claims they’ve developed their own LED chips for either daylight (with blue spectra) or nighttime (without blue spectra).

Very interesting – I’m guessing they ordered a custom phosphor batch and then went to a small fab for a pilot run?