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8 years ago No Comments

(pronounced LU-men)

It’s easy to remember that this word relates to lighting and the emitting of light – just think of words you probably already know such as luminaire, luminaria and luminary. What’s not as easy is

8 years ago No Comments

We’ve defined lumen for you, and you probably understand depreciation (especially if you’ve ever bought a new car and then tried to sell it after just one year).