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Street and Roadway Lighting Design: Definitions and Concepts, Exams of Advanced Education

Stephen F. Austin State University (SFA)Advanced Education

A comprehensive overview of key terms and concepts related to street and roadway lighting design. It defines essential elements such as lighting installation, lighting system, luminaire, road width, outreach, overhang, mounting height, spacing, and tilt angle. The document also explores different pole arrangements based on road width and mounting height, including single-sided, opposite-sided, and central arrangements. Additionally, it discusses the importance of voltage drop calculation and provides basic formulas for determining voltage drop and percent voltage drop.

Typology: Exams

2024/2025

Available from 02/20/2025

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STREET AND ROADWAY LIGHTING DESIGN 100% VERIFIED
Lighting Installation - ANSWER is defined as the whole of the equipment
provided for lighting the roadway
comprising the lamp luminaires, means of
support and electrical and electrical
installations including other auxiliaries.
Lighting System - ANSWER refers to an array of luminaires having a
characteristic of light distribution.
Luminaire - ANSWER is a housing for one or more lamps
comprising body and any refractor, diffuser
or enclosure associated ·with the lamp.
Road Width - ANSWER is the distance between the edges of the
road curbs measured at right angles to the
length of the roadway.
Outreach - ANSWER is the distance measured horizontally
between the outer of the column or wall
face or lamp post and the center of the
luminaire.
Overhang - ANSWER is the horizontal distance between the
center of luminaire and the adjacent edge
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STREET AND ROADWAY LIGHTING DESIGN 100% VERIFIED

Lighting Installation - ANSWER is defined as the whole of the equipment provided for lighting the roadway comprising the lamp luminaires, means of support and electrical and electrical installations including other auxiliaries.

Lighting System - ANSWER refers to an array of luminaires having a characteristic of light distribution.

Luminaire - ANSWER is a housing for one or more lamps comprising body and any refractor, diffuser or enclosure associated ·with the lamp.

Road Width - ANSWER is the distance between the edges of the road curbs measured at right angles to the length of the roadway.

Outreach - ANSWER is the distance measured horizontally between the outer of the column or wall face or lamp post and the center of the luminaire.

Overhang - ANSWER is the horizontal distance between the center of luminaire and the adjacent edge

of the road.

Mounting Height - ANSWER is the vertical distance between the center of the luminaire and the surface of the roadway.

Spacing - ANSWER is the distance between the successive Iuminaires in an installation.

Tilt Angle - ANSWER the angle between the luminaire surface and the horizontal plane (the surface parallel to the roadway).

  • ANSWER In order to attain the maximum utilization of light from the fixtures the luminaires should be mounted under the following specifications: **- 20500 lumens for 400 watts
  • 11500 lumens for 250 watts
  • 5400 lumens for 125 watts** - TYPICAL VALUE OF AVERAGE LUMENS

Single Sided - WHEN THE WIDTH W OF THE STREET (ROAD) IS LESS THAN OR EQUAL TO THE MOUNTING HEIGHT (H), i.e. WHEN W = H THEN THE POLES ARE ARRANGED IN ONE SIDE OF THE STREET ONLY. GENERALLY, POLE HEIGHT IS AVAILABLE OF 8 ~12 METERS. spacing between two poles is equal to the

load current.

k D I x Sqrt(R2 + X2) - ANSWER Basic Formulas: Voltage Drop (Vd)

Percent Vd - ANSWER Basic Formulas: = (Vd / VS )100%