Spectral Blackbody Emissive Power is the amount of radiation energy emitted by a blackbody at an absolute temperature per unit time, per unit surface area, and per unit wavelength. And is denoted by Ebλ. Spectral Blackbody Emissive Power is usually measured using the Watt per Cubic Meter for Emissive Power per Unit Wavelength. Note that the value of Spectral Blackbody Emissive Power is always positive.