number density
light-scattering photometry
photoreduction
spectrophotometer
photoeffect
photooxidation
photoelectromagnetic
photopolarimetric
polarimetry
charge unit
quantity unit
ceptometer
photoconduction
radiative recombination
kerma
thermionic current
cd
densitometry
photoionisation
electronmicrographic
photoelectrocatalysis
monochromatic
bolometric magnitude
candle
radiation physics
candela
homochromatic
photothreshold
spectrophotometry
photoelectrocolorimetry
standard candle
angstrom star
actinism
kiloelectronvolt
infrared spectrum
luminous intensity unit
kilocount
candlepower unit
pulse counter
lumen-hour
antibunching
X-ray fluorescence
radiometry
Planck charge
fluence
secondary emission