Based on the definition of apparent brightness,which units are appropriate for its measurement?

Question

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Apparent brightness is a measure of the amount of light that appears to be coming from a source as seen from a particular vantage point. It is typically measured in units of watts per square meter (W/m²), which is the amount of electromagnetic radiation (i.e. light energy) passing through a specific area per second. Watts (A) and Joules (B) are units of power and energy, respectively, and are not appropriate for measuring the brightness of a source. Newtons (D) are units of force and are also not appropriate for brightness measurements.

Based on the Definition of Apparent Brightness,which Units Are Appropriate