Gravity fall of light: An outline of a general relativity test

We have found the following general relativity (GR) result: when a light ray is emitted and travels in a (nearly) uniform gravitational field g, its parabolic trajectory is that of one that would be traced by a massive Newtonian particle in a field three times greater, $3g.$ So, if a photon departs from a point on the Earth’s surface, with an initial horizontal direction, and goes over a distance $\Delta L\left[\right(\Delta L/R)\ll 1],$ its linear vertical deflection is $\Delta H_{\mathrm{GR}}=\frac{3}{2}\left[g\right(\Delta {L)}^2{/c}^2].$ The Newtonian result would be three times smaller. That is to say, the principle of equivalence is responsible for one-third of the vertical deflection. We think that this remarkable difference deserves research into the possibility of a GR test based on the vertical fall of terrestrial light.