lumen-hour
[ loo-muh n-ouuh r, -ou-er ]
/ ˈlu mənˌaʊər, -ˌaʊ ər /
noun Optics.
a unit of luminous energy, equal to that emitted in 1 hour by a light source emitting a luminous flux of 1 lumen. Abbreviation: lm-hr
Origin of lumen-hour
First recorded in 1920–25
Words nearby lumen-hour
lumbricoid,
lumbricosis,
lumbricus,
lumbus,
lumen,
lumen-hour,
lumholtz's kangaroo,
luminaire,
luminal,
luminance,
luminaria