Rachel talks about the reality of where we are at with circiadian lighting systems, what we know and what's still to be determined.  With a technical background in lighting and 15 years of experience, she points out that while things like equivalent melanotic lux (EML) have been established and the industry continues to work on developing metrics for circadian stimulus, lighting design isn't that simple. Thinking through the use of an interior environment is much more important than just placing "color tunning" lights in a space.