Wave equation is NOT an electromagnetic wave equation

It is shown that the wave equation only in the first approximation can be considered the equation of an electromagnetic wave, and therefore it is offered a new equation is proposed for electromagnetic wave, which also follows from the system of Maxwell's equations. This equation demonstrates the strict observance of the law of conservation of energy, the phase shift between electric and magnetic intensities, the conversion of energy from magnetic to electric and vice versa, the twist of an electromagnetic wave.