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The second.

I see the "second" as a measure of time, not light.

LUX, Lumen or Candela do ring a bell and something like watt per square meter

..

Yes the S.I. unit measure of light is a limen (lm) .

lumen (lm)

The SI derived unit for measuring the luminous flux of light being produced by a light source or received by a surface. The luminous intensity of a light source is measured in candela. One lumen represents the total flux of light emitted, equal to the intensity in candela multiplied by the solid angle in steradians (1/(4pi) of a sphere) into which the light is emitted. Thus the total flux of a one-candela light, if the light is emitted uniformly in all directions, is 4pi lumen.

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