Question

A light source emits monochromatic light of 555 nwavelengthm. The source consumes 100 W of electric power and emits 35 W of radiant flux. Calculate the overall luminous efficiency.

Answer 1

Explanation:

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Answer 2

A light source emits monochromatic light of 555 nm wavelength. The source consumes 100 W of electric power and emits 35 W of radiant flux. Then the overall luminous efficiency is about 240 lm/W.

Explanation:

Step 1:

Given data in the question  

A source of light emits monochromatic light Wavelength,  λ =  555 nm

Electric power  Radiant  emitted  flux = 35 W

The source is consuming  input  Power  =  100 W

Step 2:

We know that  total luminous efficiency  

$Total luminous efficiency = \frac{Net luminous flux }{ power}$

$=\frac{35 \times 685}{100}$

$=\frac{23975}{100}$

$=239.75 \mathrm{lm} / \mathrm{W}$

Therefore the luminous efficiency total will be 240 lm/W.