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Lichtstärke
- Iv (Ω) = dΦV / dΩ
- [lm/sr] = [cd]
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Spektraler Lichtstrom
- ΦV (λ) = Km * V(λ) * Φe(λ)
- Km = 683lm/W
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Spektraler Strahlungsfluß
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Leuchtdichte
- LV(Ω) = dIV / dAS = dΦ / dΩ * dAS
- [cd/m²]
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Beleuchtungsstärke
- EV = dΦV / dAD
- [lm/m²] = [lx]
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Photometrisches Grundgesetz
- ΦV = LV * AS * ΔΩS = EV *AD = EV * ΔΩS * r²
- => LV *AS = EV * r²
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Großer Lambertstrahler
- Iv(α) = LV * AS = LV * AS,0 * cos(α) = IV,0°
- Lichtstärke IV = konstant
- Fläche A hängt von cos ab
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Kleiner Lambertstrahler
- Iv(α) = LV * AS = LV * AS,0 * cos(α) = IV,0°LV(α) = LV,0° = konst.
- keine winkelunabhängige IV mehr
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