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EmilyB.Radiant Exposure
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The Radiant Exposure calculator computes the radiant exposure based on the irradiance of the surface and the time of exposure.

INSTRUCTIONS: Enter the following:

• (Ev)  This  is the irradiance of the surface area in watts per square meter.
• (t) This is the  duration of the exposure

Radiant Exposure (He):  The calculator returns the exposure in Newtons per Meter which is equivalent to Joules per seconds • meter square (J / s•m²).

#### The Math / Science

The Radiant Exposure in photography is the amount of light per unit area reaching a photographic film or electronic image sensor, as determined by shutter speed, lens aperture and scene luminance. The formula for radaint exposure is:
He = Ev • t
where: