The Danjon Scale of lunar eclipse brightness is a five-point scale useful for measuring the appearance and luminosity of the Moon during a lunar eclipse. It was proposed by André-Louis Danjon when he was measuring the Moonshine on the Earth. An eclipse's rating on the Danjon Scale is denoted by the letter L.
Read more about Danjon Scale: The Scale, Determining The Value of L, Factors Affecting The Value of L
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“I own I never really warmed
To the reformer or reformed.
And yet conversion has its place
Not halfway down the scale of grace.”
—Robert Frost (1874–1963)