The spectral flexibility of LEDs has opened up a whole new world of possibilities when it comes to color rendition, and the IES's TM-30 — specifically Annex E — is the new standard to guide you through it. Jason Livingston, Principal at Studio T+L, and Tony Esposito, Founder & Head Researcher at Lighting Research Solutions, take us through the basics of the new measures introduced in Annex E, and discuss why TM-30's multi-dimensional approach to quantifying color preference is superior to the old-standby in the industry: CRI.