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10 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

10 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).