Brightness and color temperature.
![Review: Lighting Passport spectrometers](https://www.dvinfo.net/wp-content/uploads/2015/06/LP-P1000485-351x185.jpg)
Breakfast foods grow odder and odder: It’s a wise child that knows its own fodder. — Ogden Nash, “Snap, Crackle, Pop” As with foods, so with lights: between LEDs, HMIs, plasmas, and fluorescents, it’s hard to know exactly what you’re…