Well scientists has been trying very hard to replicate energy and waves in lab settings … We can produce waves or lights through sources and we can detect the amount of energy such wave or light produces or projects on the human eyes or body by using simulated environment or computers! So we can understand all the details and hence we can explain why it behaves in such manner!
I hope the answer is not confusing and if it is please give me a nudge 🙂
The light from a light bulb contains lots of different wavelengths of light – not just visible ones either. Scientists use machines called spectrometers (literally, spectrum measuring devices) that can detect an measure these wavelengths. It is then possible to generate each individual wavelength and even mix them in the right proportions to give back the same light as the light bulb gives out. Does this help?