Light & Optics Labλ = c / f • E = hf
700 nm to RGB & Color Calculator
Approximate how 700 nm monochromatic spectral light can be represented in sRGB, and calculate CIE 1931 tristimulus values, THz frequency, and photon energy.
CIE 1931 Spectral Synthesis
Deep Red700 nm
#FF8A00
nm
380 nm (Violet)555 nm (Peak)750 nm (Deep Red)
Frequency
428.275 THz
Photon Energy
1.771 eV
sRGB Channels
255, 138, 0
CIE 1931 XYZ
0.0057, 0.0043
Why You See This Color (700 nm)
At 700 nm, Long-wavelength sensitive (L) cone responses dominate, although cone sensitivity curves overlap rather than switching on or off at exact boundaries. With a frequency of 428.275 THz and lower photon energy (1.771 eV), this stimulus is generally perceived as deep red. Near the 700–750 nm boundary, eye sensitivity tapers toward the infrared threshold.
Physical Parameter Breakdown
Wavelength (λ):700 nm (700 × 10⁻⁹ m)
Oscillation Frequency (f):428.275 THz
Photon Quantum Energy (E):1.771 eV
CIE 1931 Tristimulus (XYZ):X:0.0057 Y:0.0043 Z:0
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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