Optics/Evidence for light as a stream of particles

Light is the thing we define as the visible part of the spectrum of electromagnetic waves.

With the help of the impulse of a particle and the impulse of a(n) (electromagnetic) wave, evidence for light being a stream of particles and vice versa can be found.

The impulse/momentum of a "normal particle" is defined as:

$$p(\text{particle}) = mv$$

A scientist named Louis de Broglie found that the wavelength of an electromagnetic wave can be approached with planck's constant and the impulse of the waves. The formula looks like this:

$$\lambda = {h \over p}$$

or

$$p(\text{EM}) = {h \over \lambda}$$

Applying $$p = mv$$, we get:

$$\lambda = {h \over {mv}}$$

Rearranging the above equation, we have:

$${h \over \lambda} = mv$$

Which is equivalent to:

$$p(\text{EM}) = p(\text{particle})$$

Therefore, we conclude that an electromagnetic wave is just a stream of particles and vice-versa.