Buying patio lights can be a lot of fun. If you’ve just moved into a new house and finally installed patio lights or if you’ve just installed outdoor party string lights for a birthday party, then you know how much fun it can be setting this type of thing up. It really doesn’t need to be difficult, and you can get a lot done simply by putting in the time and effort to get things working the right way. The main properties of both visible light and other types of ‘light’ are how intense the light is, what direction it is going, what its frequency is, what the wavelength spectrum is, what the polarization is, and the fact that its speed in a vacuum is a fundamental constant of nature.

This stuff is fast! It goes 299,792,458 meters per second, which is really, really fast. At that speed, the sun is eight minutes away. That’s shorter than the time it takes for you to get up from your desk and go grab a drink of soda! The speed of light is not something that you need to worry about when you buy lights for your patio. The other things, the intensity, the direction, the frequency, and sometimes the polarization, you sometimes do. Throwing in layman’s terms for all of this: how bright do you want it? Where do you want it to point? What color do you want it to be? Do you need it to do anything special?

Frequency and wavelengths are representations of the color. In case you’ve never thought about it, the term ‘ultraviolet’ has the world ‘violet’ in it, referring to the color. Ultra means extreme. Basically, the light that is responsible for getting you in all kinds of trouble is light that is very, very purple. The word ‘infrared’ isn’t as obvious, but the last three letters of ‘Infrared’ spell ‘red’. Heat is basically red that is very, very red, to the point where you can feel it.

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