Brillengewicht

Brillengewicht is a fictional quantity used in discussions of visual perception to describe the relative contribution of different spectral components to perceived brightness of a light source. It is meant to capture how human observers weight spectral content differently from purely physical power, under specified viewing conditions.

In the imagined framework, Brillengewicht is derived from a weighted spectral integral. The weight function W_eff(λ) combines the standard luminous efficiency function V(λ) with adaptation factors for ambient light, observer age, and temporal response. A simple representation is B = ∫ S(λ) W_eff(λ) dλ, where S(λ) is the spectral power distribution of the source. The exact form of W_eff depends on the chosen model.

Applications include theoretical studies of display and lighting design, color grading, and vision science, where perceptual brightness is more relevant than raw radiant power. Brillengewicht complements luminance by emphasizing spectral sensitivity differences across conditions.

Limitations: because it is not an established physical quantity, values are model-dependent and may vary between researchers. It does not replace measured luminance but offers a perceptual proxy for comparative studies. Real-world use requires careful specification of viewing conditions and observer models.

See also: Luminance, Luminous efficiency function, Color appearance model, Perceived brightness.