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brightness
Definition
Brightness is how bright something is.
The brighter something is, the more light it reflects or gives off.
Brightness can be measured in lumens or candelas. Lumens measure the total amount of light that a source emits, while candelas measure the amount of light that is emitted in a specific direction.
How can the word be used?
The brightness of the sun was blinding.
Different forms of the word
Noun:
brightness (the quality of being bright).
brightness (the amount of light that is emitted by a source).
Adjective:
bright (having a lot of light).
bright (clear and shining).
Verb:
to brighten (to make something brighter).
to brighten (to become brighter).
Etymology
The word "brightness" comes from the Old English word beorht, which means "bright, shining, or clear." The Old English word beorht is thought to be related to the Proto-Germanic word berhtaz, which also means "bright, shining, or clear.".
Question
What determines the brightness of a bulb?