| Terms for subject Lighting (other than cinema) (1011 entries) |
| opakt medium | opaque medium | |
| oppfattet farge | colour | |
| optisk tettleik for reflektansfaktor | reflectance factor (optical) density | |
| ordinær armatur | ordinary luminaire | |
| overettmerker | leading marks | |
| overlys | skylight | |
| parallellkatodeforvarming | parallel cathode preheating (of a discharge lamp) | |
| pendelarmatur | pendant luminaire | |
| Plancks lokus | Planckian locus | |
| plassbelysning | local lighting | |
| polarisert stråling | polarized radiation | |
| prefokussokkel | prefocus cap | |
| primærlyskilde | primary light source | |
| pullert | bollard | |
| purpurstimulus | purple stimulus | |
| radians | radiance (in a given direction, at a given point of a real or imaginary surface) | |
| radianskoeffisient | radiance coefficient (at a surface element of a medium, in a given direction, under specified conditions of irradiation) | |
| radiometer | radiometer | |
| redningslampe | mine rescue luminaire | |
| referansebelysning | reference lighting |