Troland

Rarity: Common

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What Wikipedia says

The troland (symbol Td), named after Leonard T. Troland, is a unit of conventional retinal illuminance. It is meant as a method for correcting photometric measurements of luminance values impinging on the human eye by scaling them by the effective pupil size.

Excerpt from the Wikipedia article “Troland”, under the CC BY-SA 4.0 license. Read the article on Wikipedia