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3D Time-of-flight distance measurement with custom - Universität ...

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APPENDIX 189<br />

8.3 Conversion: LUMEN, WATT and CANDELA<br />

Conversion <strong>of</strong> candela (cd) to watt (W)<br />

Iv<br />

Φ e<br />

Light intensity in candela<br />

[ W]<br />

= I [ cd]<br />

⋅ angle[<br />

sr]<br />

v<br />

1<br />

⋅<br />

V e<br />

( λ )<br />

V(λe) Spectral luminous intensity. Normalized to the human spectral<br />

daylight viewing sensitivity.<br />

Φe<br />

Radiant flux in watt<br />

Conversion <strong>of</strong> lumen (lm) to Watt (W)<br />

Φv<br />

Φe<br />

Φ e<br />

Luminous flux in lumen<br />

Radiant flux in watt<br />

[ W]<br />

= Φ [ lm]<br />

V(λe) Spectral luminous intensity<br />

v<br />

1<br />

⋅<br />

V e<br />

( λ )

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