It can be difficult to get our heads around a concept like the electromagnetic field. It is a complex and extensive subject. Still, we need to know that what we call 'light' is more appropriately called "visible light," and resides in the electromagnetic spectrum. It makes up a very small fraction of the entire field, which consists of: Radio waves--Microwave--Infrared--Visible Light--Ultraviolet--X-Ray--Gamma Ray.
Within visible light there is a subset of 7 parts, as there is in the electromagnetic field. (it might be of interest to know there are 7 musical notes as well) These are what we call colors. Red--Orange--Yellow--Green--Blue--Indigo--Violet. Just as in the EM field, working from left to right, red is a lower frequency than orange; as radio waves are lower in frequency (energy) than microwaves.
So what does all this mean? What you perceive as color is just energy (light) operating at a particular frequency. The frequency of color is measured in 'terahertz,' which is the number of cycles per second. (terahertz = one trillion cycles per second) So red, which vibrates at 400 to 484 terahertz, is vibrating 400 trillion + times per second. And red is the "slow" one! (violet vibrates at 700 trillion + times per second) And that rate of speed is simply incomprehensible.
Understand, I am not disputing the science. I accept it. It's just too much for me to process. I can't wrap my head around it. I find this mindset beneficial when I talk to an agnostic or atheist. I contend that 'God' is everywhere and everything. As possible explanations go, atheist's "can't see it." And that's alright. But if something as simple as color vibrates at such velocity, then maybe what we call God vibrates at the rate of a centillion. (that's 303 zeros behind a number) After all, who can say? We'll just have to wait and see.