Glossary
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Candela

Candela is the unit of SI-base size light intensity and describes, from a source in a specific direction given, brightness (lumen). A candle provides about 1 Candela.
The size includes the human impression of brightness. Therefore pure UV or IR radiation is always 0 Candela.
The corresponding energy magnitude woulb be the radiation intensity. It is then also applicable to radiation sources outside the visible range.