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Illumination Based Problems




        Vijay Balu Raskar (B.E.Electtrical)
NOTE:-
Before Designing assume following things clearly.

Assumptions are required for illumination.
Assume Depreciation Factor = 1.2
Assume Maintenance Factor = 0.8
Utilization Factor = 0.6 to 0.9
Assume illumination is free from glare
Assume illumination is free from dark shadows
Assuming lamps are arranged to give uniform illumination.
Reflective index of wall and ceiling is maximum.
Selecting a fluorescent tube light
Space to height ratio along the length and breadth is less
than or equal to 1.5
Assume Height of mounting of Lamp ( as per area)

                   Vijay Balu Raskar (B.E.Electtrical)
Example -6

• A big hall of (30 m (L) X 12 m (b)) is to be
  illuminated and illumination required is
  50m candles.
• Assuming a suitable data and calculated
  space height ratio, a utilization factor of
  0.5, depreciation factor of 1.3, Estimate
  the no. rating and disposition of lamps.
Five types of lamps having lumen output as given below,

   Sr. No Watts   Lumens
   1      100     1615
   2      200     3650
   3      300     4700
   4      500     9950
   5      1000    21500
Design considerations

• Illumination required is = 50 lux.

• Depreciation Factor = 1.3
• Let Mounting height be 5m
Calculation of No. of lamps required
• From Table on Lamp Data (Given)
 We have,               AXEXDF 30 X 12 X 50 X 1.3
 Gross Lumen Required =                           46800
                          UF          0.5
  Number of lamp required,
  For 100W         46800
                             29
                  1615
  For 200W        46800
                             13
                  3650
  For 300W        46800
                             10
                  4700
  For 500W        46800
                             5
                  9950
  For1000W
                  46800
                             2
                  21500
Layout
• Taking arrangement as
• Let suitable type of lamp will be 300W
  (take any lamp) i.e. No of lamp = 10
• No. lamps in one row = 5
• No. of rows = 2
• For hall illumination, no black board.
• Distance along the length, a = 30/6 = 5m
• Distance along the width, b = 12/ 3 = 4 m
• DRAW LAYOUT
S Ratio = Spacing Between Lamps
H        Height of mounting of Lamp


Along Length
                 5
                   1
                 5
                S
                  Ratio 1
                H
  Space to height ratio is unity.

                  4
  Along Width           0 .8
                  5
                S
                  Ratio         0 .8
                H
   Space to height ratio is 0.8. Lamps of lower wattage
   will require more number of fittings and therefore will
   increases the cost.
HOME WORK
Solved same problem but select different lamp than 300W.
Solve for 100W
Solve for 200W
Solve for 500W
Solve for 1000W

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Illumination Example 6

  • 1. Illumination Based Problems Vijay Balu Raskar (B.E.Electtrical)
  • 2. NOTE:- Before Designing assume following things clearly. Assumptions are required for illumination. Assume Depreciation Factor = 1.2 Assume Maintenance Factor = 0.8 Utilization Factor = 0.6 to 0.9 Assume illumination is free from glare Assume illumination is free from dark shadows Assuming lamps are arranged to give uniform illumination. Reflective index of wall and ceiling is maximum. Selecting a fluorescent tube light Space to height ratio along the length and breadth is less than or equal to 1.5 Assume Height of mounting of Lamp ( as per area) Vijay Balu Raskar (B.E.Electtrical)
  • 3. Example -6 • A big hall of (30 m (L) X 12 m (b)) is to be illuminated and illumination required is 50m candles. • Assuming a suitable data and calculated space height ratio, a utilization factor of 0.5, depreciation factor of 1.3, Estimate the no. rating and disposition of lamps.
  • 4. Five types of lamps having lumen output as given below, Sr. No Watts Lumens 1 100 1615 2 200 3650 3 300 4700 4 500 9950 5 1000 21500
  • 5. Design considerations • Illumination required is = 50 lux. • Depreciation Factor = 1.3 • Let Mounting height be 5m
  • 6. Calculation of No. of lamps required • From Table on Lamp Data (Given) We have, AXEXDF 30 X 12 X 50 X 1.3 Gross Lumen Required = 46800 UF 0.5 Number of lamp required, For 100W 46800 29 1615 For 200W 46800 13 3650 For 300W 46800 10 4700 For 500W 46800 5 9950 For1000W 46800 2 21500
  • 7. Layout • Taking arrangement as • Let suitable type of lamp will be 300W (take any lamp) i.e. No of lamp = 10 • No. lamps in one row = 5 • No. of rows = 2 • For hall illumination, no black board. • Distance along the length, a = 30/6 = 5m • Distance along the width, b = 12/ 3 = 4 m • DRAW LAYOUT
  • 8. S Ratio = Spacing Between Lamps H Height of mounting of Lamp Along Length 5 1 5 S Ratio 1 H Space to height ratio is unity. 4 Along Width 0 .8 5 S Ratio 0 .8 H Space to height ratio is 0.8. Lamps of lower wattage will require more number of fittings and therefore will increases the cost.
  • 9. HOME WORK Solved same problem but select different lamp than 300W. Solve for 100W Solve for 200W Solve for 500W Solve for 1000W