luminous flux density

luminous flux density

[′lü·mə·nəs ′fləks ′den·səd·ē]
(optics)
References in periodicals archive ?
The quantum system's photosynthetic photon flux density, or PPFD (the equivalent of the radiometric system's irradiance and the photometric system's luminous flux density), is represented by the area under the quantum response curve bounded by 400 and 700 nm, the wave band known as the photosynthetically active radiation (PAR).