Photometric performance of roadway and street lighting luminaires
This Standard specifies photometric performance requirements for luminaires that are used for roadway and street lighting applications as a function of unit power density (UPD).
The following light sources are addressed in this Standard:
clear HPS lamp
clear metal halide lamp and
This Standard is based on
average luminance, luminance uniformity ratio, and veiling luminance ratio as defined in ANSI/IES RP-8;
nominal input power in watts for HID sources;
rated lamp lumens for HID sources;
relative photometry for HID sources as per ANSI/IES LM-63 and IES LM-31
luminaire input power in watts and rated luminaire lumens for LED sources and does not include constant light output (CLO) applications; and
absolute photometry for LED sources as per IES LM-79.
This Standard is not a design document, and is intended to establish luminaire photometric performance efficiency only, based upon typical roadway configuration.
Tables 4, 5, and 6 are intended to be used to establish maximum UPD values for typical applications as per the parameters listed in Table 1. UPD values provided in this Standard are not intended for specification or application purposes.
User specific road geometries could differ from the templates used in the creation of these Tables. Requirements of specific designs might necessitate different variations in distribution, lumen packages, and wattages. Users should review UPD as a measure of comparison across suppliers, within their own geometry, and should note that UPD levels will then vary from the Tables within this Standard.
The UPD values for all luminaires in Tables 4, 5 and 6 do not include ballast or driver losses and ballast factor (BF). The UPD values for all applications include a light loss factor of 1 (LLF = 1).
For site specific installations, it is the responsibility of designers to select the optimal combination of fixture type, pole height, spacing, and appropriate light loss factor to ensure an optically efficient design. For guidance on design, see ANSI/IES RP-8.
In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the Standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.