Einstein's Equivalence Principle.
If the source of the Energy is not Potential Gravitational Energy as it is in RE what is it to comply with the UA theory ?
Our existentialist, relativist, nihilist, determinist, fascist, eugenicist moderator hath returned.
objectively good
Sorry, but it works exactly the same way on the FE.
there is no optical light, there is just light and theres no other type of light unless you start talkling about energy saving lightbulbs compared to other types of light bulbs