Wavelength: 380–450 nm
Frequency: 680–790 THz
Photon Energy: 2.95–3.10 eV

Sahasrara (Crown Chakra)
Element: Cosmic Energy
Color: Violet or White
Sound: OM
Life theme:
The crown chakra connects to beauty itself and the spiritual realm. It helps you to understand who you are beyond your physical self—that you are a spiritual being having a human experience. It is not located in the body but actually hovers above the crown of the head. When it’s closed, you think happiness can only come from the outside, and you suffer. Working on this chakra helps you to feel free in any situation.

https://www.yogajournal.com/practice/beginners-guide-chakras