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According to SI standards, the power per unit area is called the irradiance and intensity is a different quantity. However, colloquially, intensity and absolute intensity is also used for irradiance. StellarNet uses the two words interchangeably to mean power per unit area. Because power is a type of flux, this means irradiance is also a flux density because it is divided by unit area.

When talking about light, intensity is the power per unit area when the light is transmitted through a (real or imaginary) flat surface that is perpendicular to the direction of the beam. It is usually represented by the symbol Iand common units are W/m2 or W/cm2. For example, if a laser beam is circular with a radius of 1 mm and has a power of 100 mW, the intensity is:

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Several characters who are each at critical stages of their lives are strangely impelled towards an uncharted lake in the middle of the desert where they all have the opportunity to save eac... Read allSeveral characters who are each at critical stages of their lives are strangely impelled towards an uncharted lake in the middle of the desert where they all have the opportunity to save each other.Several characters who are each at critical stages of their lives are strangely impelled towards an uncharted lake in the middle of the desert where they all have the opportunity to save each other.

Note: Whenever a quantity is modified by the word “spectral,” this implies the quantity per wavelength/frequency. For example, the spectral irradiance is the irradiance at each wavelength.

Claire: [speaking on cell phone] What I mean is, that he jumped into the lake, drowned, and woke up trying to save Jennifer.