Wavelength: 625–740 nm
Frequency: 405–480 THz
Photon Energy: 1.65–2.00 eV

Muladhara (Root Chakra)
Element: Earth
Color: Red
Sound: Lam
Life theme:
The Muladhara governs your family ties and feelings of survival, belonging, and guardedness. Your earliest memories are stored here, including whether or not your basic needs were met. When it is blocked or out of balance, you can become needy, have low self-esteem, or have self-destructive behaviors. When Muladhara is in balance, you feel strong and confident; you can stand up on your own two feet and take care of yourself.
https://www.yogajournal.com/practice/beginners-guide-chakras