Luminous flux
= Luminous flux
{title2=$\Phi_v$}
{wiki}
<Luminous flux> is the visually weighted counterpart of <radiant flux>, measured in lumens. Its value depends on the <optical spectrum> and the specified visual response; it is distinct from <radiant flux> in <watts>.<OSA Handbook of Optics, Volume III Visual Optics and Vision/Radiometry and Photometry: Review for Vision Optics>{ref}