Einstein's description of light as being composed of energy quanta extended Planck's notion of quantized energy, which is that a single quanta of a given frequency, f, delivers an invariant amount of energy, hf. In nature, single quanta are rarely encountered. The Sun and emission sources available in the 19th century emit vast amount of energy every second. The Planck constant, h, is so tiny that the amount of energy in each quanta, hf is very very small. Light we see includes many trillions of such quanta.