radiant intensity

British  

noun

1.  Ie.  a measure of the amount of radiation emitted from a point expressed as the radiant flux per unit solid angle leaving this source

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Example Sentences

A light source with monochromatic radiation of frequency frequency 540 × 1012 Hz and radiant intensity of 1/683 watt per steradian.

From The Verge

Ullmann will turn 76 this month, and while she lacks the artificial youthfulness of too many American celebrities, in person she has the same radiant intensity she displayed decades ago in classic Bergman films like “Persona” or “Cries & Whispers.”

From Salon

Open--and what we have learned is that, although another Woods is not yet on the horizon, the sun still shines on the game, sometimes with radiant intensity, as it did Sunday at the Masters when we were reminded that golf is bigger than any one person.

From Golf Digest