Redshift causes light to shift towards the red end of the spectrum, resulting in a reduction of photon energy, but this does not violate the conservation of energy law because energy is frame-dependent. In different frames of reference, energy measurements can vary, yet energy remains conserved within each frame. The energy loss observed in redshift scenarios, such as a spaceship moving away from a laser, is compensated by energy being stored in the light column between the two. Additionally, in cases of gravitational redshift, energy is transformed into gravitational potential energy. Thus, the conservation of energy holds true across varying frames of reference.
