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// A Texbook on POWER SYSTEM ENGINEERING
// A.Chakrabarti, M.L.Soni, P.V.Gupta, U.S.Bhatnagar
// DHANPAT RAI & Co.
// SECOND EDITION
// PART IV : UTILIZATION AND TRACTION
// CHAPTER 4: ILLUMINATION
// EXAMPLE : 4.8 :
// Page number 758
clear ; clc ; close ; // Clear the work space and console
// Given data
b = 15.25 // Breadth of workshop(m)
l = 36.6 // Length of workshop(m)
no = 20.0 // Number of lamps
P = 500.0 // Power of each lamp(W)
n = 15.0 // Luminous efficiency of each lamp(lumens/watt)
df = 0.7 // Depreciation factor
cou = 0.5 // Co-efficient of utilization
// Calculations
lumen_lamp = no*P*n // Lamp lumens
lumen_plane = lumen_lamp*df*cou // Lumens on the working plane
I = lumen_plane/(l*b) // Illumination(lm/sq.m)
// Results
disp("PART IV - EXAMPLE : 4.8 : SOLUTION :-")
printf("\nIllumination on the working plane = %.1f lm per sq.m\n", I)
printf("\nNOTE: ERROR: The breadth should be 15.25m but mentioned as 5.25m in textbook statement")
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