gossamer-thin
opacity
dark field illumination
photoresistance
opaque
lucifugal
loosefill
dark ground illumination
optical opacity
lucifugous
brightness level
luminousness
luminance
light
radiophotoluminescence
darkly
baryonic dark matter
brightness
luminar
photochromism
luminosity
phototheranostic
dark
holophotal
luminiferous
in darkness
photocorrosion
Vitaglass
cathodochromism
metallophotonic
photoefficiency
photoresponsive
lucid
photophysics
practical light
transparently
caustic
atomic absorption spectroscopy
light-tight
photostabilizer
fluorescence
optical phenomenon
darkness
overexpose
sparkling
abacination
translucent