7-1.1

speed of light in a medium

c

m/s

L·T⁻¹

7-1.2

refractive index

n

1

1

7-2.1

radiant energy

Q_e

J

M·L²·T⁻²

7-2.2

spectral radiant energy

Q_eλ

J/nm

M·L·T⁻²

7-3.1

radiant energy density

w

J/m³

M·L⁻¹·T⁻²

7-3.2

spectral radiant energy density in terms of wavelength

w_λ

J/(m³·nm)

M·L⁻²·T⁻²

7-3.3

spectral radiant energy density in terms of wavenumber

w_ṽ

J/m²

M·T⁻²

7-4.1

radiant flux

Φ_e

W

M·L²·T⁻³

7-4.2

spectral radiant flux

Φ_eλ

W/nm

M·L·T⁻³

7-5.1

radiant intensity

I_e

W/sr

M·L²·T⁻³

7-5.2

spectral radiant intensity

I_eλ

W/(sr·nm)

M·L·T⁻³

7-6.1

radiance

L_e

W/(sr·m²)

M·T⁻³

7-6.2

spectral radiance

L_eλ

W/(sr·m²·nm)

M·L⁻¹·T⁻³

7-7.1

irradiance

E_e

W/m²

M·T⁻³

7-7.2

spectral irradiance

E_eλ

W/(m²·nm)

M·L⁻¹·T⁻³

7-8.1

radiant exitance

M_e

W/m²

M·T⁻³

7-8.2

spectral radiant exitance

M_eλ

W/(m²·nm)

M·L⁻¹·T⁻³

7-9.1

radiant exposure

H_e

J/m²

M·T⁻²

7-9.2

spectral radiant exposure

H_eλ

J/(m²·nm)

M·L⁻²·T⁻²

7-10.1

luminous efficiency

V

1

1

7-10.2

spectral luminous efficiency

V(λ)

1

1

7-11.1

luminous efficacy of radiation

K

lm/W

1

7-11.2

spectral luminous efficacy

K(λ)

lm/W

1

7-11.3

maximum luminous efficacy

K_m

lm/W

1

7-11.4

luminous efficacy of a source

η_v

lm/W

1

7-12

luminous energy

Q_v

lm·s

M·L²·T⁻²

7-13

luminous flux

Φ_v

lm

M·L²·T⁻³

7-14

luminous intensity

I_v

cd

M·L²·T⁻³

7-15

luminance

L_v

cd/m²

M·T⁻³

7-16

illuminance

E_v

lx

M·T⁻³

7-17

luminous exitance

M_v

lm/m²

M·T⁻³

7-18

luminous exposure

H_v

lx·s

M·T⁻²

7-19.1

photon number

N_p

1

1

7-19.2

photon energy

Q_p

J

M·L²·T⁻²

7-20

photon flux

Φ_p

s⁻¹

T⁻¹

7-21

photon intensity

I_p

s⁻¹·sr⁻¹

T⁻¹

7-22

photon radiance

L_p

m⁻²·s⁻¹·sr⁻¹

L⁻²·T⁻¹

7-23

photon irradiance

E_p

m⁻²·s⁻¹

L⁻²·T⁻¹

7-24

photon exitance

M_p

m⁻²·s⁻¹

L⁻²·T⁻¹

7-25

photon exposure

H_p

m⁻²

L⁻²

7-26.1

tristimulus values for the CIE 1931 standard observer

X, Y, Z

1

1

7-26.2

tristimulus values for the CIE 1964 standard observer

X₁₀, Y₁₀, Z₁₀

1

1

7-27.1

CIE colour-matching functions for the CIE 1931 standard observer

x̄, ȳ, z̄

1

1

7-27.2

CIE colour-matching functions for the CIE 1964 standard observer

x̄₁₀, ȳ₁₀, z̄₁₀

1

1

7-28.1

chromaticity coordinates in the CIE 1931 standard system

x, y, z

1

1

7-28.2

chromaticity coordinates in the CIE 1964 standard system

x₁₀, y₁₀, z₁₀

1

1

7-29.1

colour temperature

T_c

K

Θ

7-29.2

correlated colour temperature

T_cp

K

Θ

7-30.1

emissivity

ε

1

1

7-30.2

emissivity at a specified wavelength

ε(λ)

1

1

7-31.1

absorptance

α

1

1

7-31.2

luminous absorptance

α_v

1

1

7-31.3

reflectance

ρ

1

1

7-31.4

luminous reflectance

ρ_v

1

1

7-31.5

transmittance

τ

1

1

7-31.6

luminous transmittance

τ_v

1

1

7-32.1

transmittance optical density

D

1

1

7-32.2

Napierian absorbance

A_n

1

1

7-33.1

radiance factor

β_e

1

1

7-33.2

luminance factor

β_v

1

1

7-34

reflectance factor

R

1

1

7-35.1

linear attenuation coefficient

μ

m⁻¹

L⁻¹

7-35.2

linear absorption coefficient

a_l

m⁻¹

L⁻¹

7-36.1

mass attenuation coefficient

μ_m

kg⁻¹·m²

M⁻¹·L²

7-36.2

mass absorption coefficient

α_m

kg⁻¹·m²

M⁻¹·L²

7-37

molar absorption coefficient

χ

m²/mol

L²