Specific charisma

Physical size
Surname	Specific charisma
Formula symbol	${\displaystyle M}$
Size and unit system unit dimension SI W · m -2 M · T −3

As specific radiation , also broadcast stream density or emission intensity (engl. Radiant exitance , outdated: radiant emittance ) refers in radiometry the electromagnetic radiation power of a surface element emits is: ${\displaystyle M}$ ${\displaystyle \mathrm {d} {\mathit {\Phi }},}$ ${\displaystyle \mathrm {d} A}$

${\displaystyle M={\frac {\mathrm {d} \Phi }{\mathrm {d} A}},}$measured in watts per square meter .

It corresponds to the radiant energy that is emitted by a surface element per unit of time: ${\displaystyle \mathrm {d} Q,}$ ${\displaystyle \mathrm {d} t}$

${\displaystyle M={\frac {\mathrm {d} ^{2}Q}{\mathrm {d} A\cdot \mathrm {d} t}}\,.}$

As radiosity (engl. Radiosity) or the electromagnetic radiation power is indicated, which is emitted from a surface which both the emitted and the reflected comprising radiation: ${\displaystyle J}$ ${\displaystyle J_{\lambda }}$

${\displaystyle J=M+{\frac {\mathrm {d} \Phi _{\text{refl}}}{\mathrm {d} A}}.}$

Relationship with other radiometric and photometric quantities

The physiologically weighted photometric equivalent is referred to as specific light emission (index for " visual "). ${\displaystyle M_{\mathrm {v} }}$ ${\displaystyle \mathrm {v} }$

Analogous to the emissive power, there is the irradiance that on a surface incoming called radiant power per unit area.

radiometric quantity	Symbol a)	SI unit	description	photometric equivalent b)	symbol	SI unit
Radiant flux radiant power, radiant flux, radiant power	${\displaystyle \Phi _{\mathrm {e} }}$	W ( watt )	Radiant energy through time	Luminous flux luminous flux, luminous power	${\displaystyle \Phi _{\mathrm {v} }}$	lm ( lumens )
Radiant intensity irradiance, radiant intensity	${\displaystyle I_{\mathrm {e} }}$	W / sr	Radiation flux through solid angles	Luminous intensity luminous intensity	${\displaystyle I_{\mathrm {v} }}$	cd = lm / sr ( candela )
Irradiance irradiance	${\displaystyle E_{\mathrm {e} }}$	W / m 2	Radiation flux through the receiver surface	Illuminance illuminance	${\displaystyle E_{\mathrm {v} }}$	lx = lm / m 2 ( lux )
Specific radiation emission current density, radiant exitance	${\displaystyle M_{\mathrm {e} }}$	W / m 2	Radiation flux through the transmitter surface	Specific light emission luminous exitance	${\displaystyle M_{\mathrm {v} }}$	lm / m 2
Radiance radiance, radiance, radiance	${\displaystyle L_{\mathrm {e} }}$	W / m 2 sr	Radiant intensity through effective transmitter area	Luminance luminance	${\displaystyle L_{\mathrm {v} }}$	cd / m 2
Radiant energy amount of radiation, radiant energy	${\displaystyle Q_{\mathrm {e} }}$	J ( joules )	by radiation transmitted energy	Amount of light luminous energy, quantity of light	${\displaystyle Q_{\mathrm {v} }}$	lm · s
Irradiation irradiation, radiant exposure	${\displaystyle H_{\mathrm {e} }}$	J / m 2	Radiant energy through the receiver surface	Exposure luminous exposure	${\displaystyle H_{\mathrm {v} }}$	lx s
Radiation yield radiant efficiency	${\displaystyle \eta _{\mathrm {e} }}$	1	Radiation flux through absorbed (mostly electrical) power	Luminous efficiency (overall) luminous efficacy	${\displaystyle \eta _{\mathrm {v} }}$	lm / W

^a)The index "e" is used to distinguish it from the photometric quantities. It can be omitted.

^b)The photometric quantities are the radiometric quantities, weighted with the photometric radiation equivalent K , which indicates the sensitivity of the human eye.