Wave Lab
Light & Optics Labλ = c / f • E = hf

720 nm to RGB & Color Calculator

Convert 720 nm monochromatic spectral light into exact digital sRGB, CIE 1931 tristimulus XYZ coordinates, THz frequency, and photon energy.

CIE 1931 Spectral Synthesis
720 nm
Deep Red
#C8DF00
nm
380 nm (Violet)555 nm (Peak)750 nm (Deep Red)
Frequency
416.378 THz
Photon Energy
1.722 eV
sRGB Channels
200, 223, 0
CIE 1931 XYZ
0.0006, 0.0008
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Why You See This Color (720 nm)

At 720 nm, photons interact exclusively with Long-wavelength sensitive (L) photoreceptor opsins in the fovea centralis. With a frequency of 416.378 THz and lower photon energy (1.722 eV), this stimulus yields the deep, saturated red sensation of monochromatic ruby and diode lasers. Near the 700–750 nm boundary, eye sensitivity tapers toward the infrared threshold.

Physical Parameter Breakdown

Wavelength (λ):720 nm (720 × 10⁻⁹ m)
Oscillation Frequency (f):416.378 THz
Photon Quantum Energy (E):1.722 eV
CIE 1931 Tristimulus (XYZ):X:0.0006 Y:0.0008 Z:0
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Traian Anghel
Traian AnghelAuthor & Reviewer

Physics Teacher & Educational Technologist • Brăila, Romania

Last Reviewed: August 2026
Wave Lab calculators are constructed using rigorous peer-reviewed physics formulas from verified metrological repositories. Every equation, spectral conversion, and acoustic property is tested against NIST, CIE, and ISO datasets.
Verified Sources:NIST CODATACIE 1931 2° ObserverNASA Glenn Research

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