An equation was derived in 2007 from the Biot-Savart equation as one of the multiple outcomes of a discovery made by Paul Marmet in 2003 that allows calculating the energy of any localized photon from its wavelength without any need to use Planck's quantizing constant:
E = e2/ 2ε₀αλ Equation (11)
in Article Field Equations for Localized Photons and Relativistic Field...
The same equation can also be derived from the Coulomb equation
The Coulomb Force equation in newtons: F=e2/4πε₀d2
The energy in joules adiabatically induced in each charge at distance d from each other: E=dF=e2/4πε₀d
But in de Broglie's double-particle photon, as established in this paper:
Article De Broglie’s Double-Particle Photon (Expanded republication PI)
the amplitude of transverse electromagnetic oscillation of both oscillating components of a localized photon on a plane transverse to the direction of motion of the photon is
d=A=αλ/2π
Subtituting for d in the Coulomb energy equation
E=e2/4πε₀d
E=e2/4πε₀αλ/2π
E=e2/2ε₀αλ Equation (11)
The proof of conformity with well established physics was given in the 2007 paper by also deriving it from the standard definition of the fine-structure constant
α = e2/ 4πε₀ħc
λf=c
λfα = e2 c/ 4πε₀ħc
ħ=h /2π
hf / 2π = e2 / 4πε₀αλ
E=hf = e2/ 2ε₀αλ Equation (16) in the 2007 paper linked above.
The quite useful Equation (10) of the 2007 paper can now be used without any need of Planck's constant to calculate the progressively changing energy of localized photons from the progressively changing transverse amplitude and frequency of their oscillating energy due to red or blue shifting.
The 2007 paper proposed the first wave of derivations from Marmet's 2003 discovery that also established the inner definitions of the local E and B fields of the Lorentz force equation for straight line motion of an electron or other charged particle F=q[E×∆E+v×(B+∆B)] as Equation (25) in this paper published in 2023:
Article Electromagnetic and Kinematic Mechanics Synchronized in thei...
For readers unfamiliar with electromagnetic mechanics, the best way to insure clear understanding of each paper is to personally numerically resolve each equation along the way to confirm the validity of the numerical values provided, by means of a pocket scientific calculator.
This numerical validation process has been made easy by all equations involving only known physical constants and a single variable.
Let also note that equation E = e2/ 2ε₀αλ is the equation that allowed to mathematically demonstrate that all classical force equations can be derived from the fundamental acceleration equation F=ma, and the reverse, as established in this paper published in 2013:
Article Unifying All Classical Force Equations
Other discussions about issues raised by electromagnetic mechanics:
https://www.researchgate.net/post/The_adiabatic_nature_of_the_energy_induced_in_charged_elementary_particles_as_a_function_of_the_inverse_of_the_distances_separating_them
https://www.researchgate.net/post/The_Hafele_Keatings_experiment_interpreted_according_to_electromagnetic_mechanics/1
And finally discusion
https://www.researchgate.net/post/Why-did-the-Lorenz-interpretation-prevail-over-Maxwells-in-defining-Electrodynamics