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Luminous Intensity

A 100 W lamp ...

Question

A 100 W lamp is rated 0.8W per candela; the luminous flux of the source is nearly :

A

1571.4 l m

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B

1603.4 l m

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C

1501.3 l m

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D

1481.6 l m

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Solution

The correct option is D $1571.4 l m$
Luminous intensity $I$ = $\frac{p o w e r}{r a t i n g}$ = $\frac{100}{0.8} = 125 C d$

Luminous flux = $4 π I$ = $4 π * 125 = 1571 l m$

Answer. A) 1571.4 lm

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