Measurement of LUX Level and Uniformity at Indoor and Outdoor Lighting (Part-2)

(3) AS per Deutsch Norm DIN 5035

  • In this Method the working plane divide into a number of sections which are at least rectangular, of ratio of length to side not less than 1: 2 but which are preferably of square shape.
  • A square grid of minimum size 1 meter is established within each section with a measurement point at the centre of each square.
  • The grid module defining the measurement points is selected so as not to coincide with the luminaire grid in either principal direction.
  • In exceptionally large interiors the grid size may be up to 5 meters. there is not any mention of accuracy limits of the method, but this is not surprising given the flexibility which the user of the method is allowed in choice of grid size.
  • The DIN system is the only one of the three methods studied to give any advice concerning illuminance measurements in obstructed interiors. Areas of the working plane located between large obstructions are treated for measurement purposes as separate spaces.

1

OUTDOOR ILLUMINATION (LUX LEVEL) MEASUREMENT

 (1) Nine Point Method for Determining Lux Levels in Street Lighting

  •  The Lux Level of Street Light is measured by 9-point method.
  • We need to make two equal quadrants between two light poles and between Pole and Rode edge.
  • Two Measuring Points below Light Pole (A1,A2)  and Two opposite side of Pole at Road Edge (A3,A4).
  • Two Point between Pole and Road edge (B1,B3).
  • One Point Between Pole  (B2) and on One Point between opposite side of Pole at road edge (B4)
  • One Point is at centre (C1).
  • Average Lux = (A1+A2+A3+A4)/16 + (B1+B2+B3+B4)/8 +C1/4

2

  • Solution
26 Lux 27 Lux 13 Lux
12 Lux 15 Lux 14 Lux
26 Lux 32 Lux 22 Lux
  • Average Lux = (A1+A2+A3+A4)/16 + (B1+B2+B3+B4)/8 +C1/4
  • Average Lux = (26+26+13+22)/16 + (12+27+14+32)/8 +15/4
  • Average Lux =20Lux 
MIN 12 Lux
MAX 32 Lux
AVG 20 Lux
U1=MIN/AVG 0.58
U2=MIN/MAX 0.38

 (2) As per Grid Point Set Up Measurement

  • Identify a horizontal grid of measurement points on the Illumination Measurement site surface. Locate measurement points on gridlines covering the test measurement area.
  • Ensure that the spacing between measurement points is uniform in both directions and is less than one-half the pole height or less than 4.5 Meter, whichever is smaller.
  • For installations with lights spaced less than 4.5 Meter apart, locate measurement points no farther apart that one-half the pole height, with at least three points between poles in both directions.
  • Record the location of all measurement grids and point layouts with dimensions from surrounding poles or other structures. Provide this information, including a sketch or rendering of the grid layouts.
  • For open areas such as main parking, make the measurement grid large enough to cover at least four poles of this Area layout and at least two Pole are covered.
  • For site perimeter open areas or areas adjacent to a building edge establish the test area measurement grid in a typical perimeter or building edge area. The depth of the test area should extend from the paved site boundary or building edge inward to the nearest line of light poles that are at least 4.5 Meter from the boundary or building edge.
  • The width of the test area must cover at least two of the poles in the line that is at least 4.5 Meter from the boundary or building edge.

(A) In Open Area

3

(B) In the Area of Site Perimeter

4

(C) Near Site Boundary Area:

5

About Jignesh.Parmar (B.E,Mtech,MIE,FIE,CEng)
Jignesh Parmar has completed M.Tech (Power System Control), B.E(Electrical). He is member of Institution of Engineers (MIE) and CEng,India. Membership No:M-1473586.He has more than 16 years experience in Transmission -Distribution-Electrical Energy theft detection-Electrical Maintenance-Electrical Projects (Planning-Designing-Technical Review-coordination -Execution). He is Presently associate with one of the leading business group as a Deputy Manager at Ahmedabad,India. He has published numbers of Technical Articles in “Electrical Mirror”, “Electrical India”, “Lighting India”,”Smart Energy”, “Industrial Electrix”(Australian Power Publications) Magazines. He is Freelancer Programmer of Advance Excel and design useful Excel base Electrical Programs as per IS, NEC, IEC,IEEE codes. He is Technical Blogger and Familiar with English, Hindi, Gujarati, French languages. He wants to Share his experience & Knowledge and help technical enthusiasts to find suitable solutions and updating themselves on various Engineering Topics.

2 Responses to Measurement of LUX Level and Uniformity at Indoor and Outdoor Lighting (Part-2)

  1. Aung Soe says:

    thanks for the sharing.

  2. Shilpesh naik says:

    This was helpful. Is there any IS standards for the streetlighting design, that defines the grid or no. of points for an area between the road.

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