Essential technical criteria to guarantee performance, safety, and durability in municipal public lighting projects.
Specifying lighting fixtures in municipal public lighting projects is a strategic step to ensure performance, electrical safety, energy efficiency, and system durability over time.
More than selecting equipment based on power or nominal luminous flux, it is necessary to consider technical, regulatory, and operational criteria that ensure the reliability of the installed base and the sustainability of modernization contracts.
In this article, we have compiled good technical practices that guide specification processes in municipal public lighting projects.
Regulatory compliance: the starting point of the technical specification.
The specification of luminaires for public lighting must, without exception, comply with applicable Brazilian standards, especially:
- Inmetro Ordinance No. 62/2022
- ABNT NBR 5101
These standards establish requirements related to:
- photometric performance
- electrical safety
- mandatory certification
- electromagnetic compatibility
- maintenance of luminous flux
Regulatory compliance is not just a technical recommendation; it is an essential regulatory requirement for bidding processes and public contracts.
Luminous flux should not be the only specification criterion.
A common mistake in municipal projects is to use only the nominal luminous flux as a comparative parameter between luminaires.
Actual performance also depends on:
- photometric distribution
- installation height
- spacing between poles
- luminous uniformity
- glare control
I.e:
More lumens doesn't necessarily mean better lighting.
Well-specified projects prioritize light quality and field performance.
Luminous efficiency should be analyzed together with optical performance.
Luminous efficacy (lm/W) is an important indicator, but it cannot be evaluated in isolation.
The following should also be considered:
- luminous uniformity
- glare control
- light distribution on the road
- maintaining flow over time
- suitability to the type of road
Municipal projects require consistent performance over years of operation, not just initial laboratory values.
The lifespan of the light fixture is not the same as the lifespan of the LED.
Values such as 100,000 hours typically refer to the maintenance of the LED's luminous flux (L70 or L80), and not to the durability of the entire luminaire assembly.
Actual lifespan depends on:
- driver
- heat dissipation
- seal
- DPS
- electronic components
- environmental operating conditions
Therefore, the specification must consider the integrated behavior of the system.
Electrical safety is one of the most important criteria in the specification.
Electrical safety is a critical factor in municipal public lighting projects.
The specification should include:
- dielectric strength tests
- protection against electric shock
- compliance with ABNT NBR IEC 60598-1
- compliance with ABNT NBR IEC 61347-1
This precaution is especially relevant in the Brazilian context, where many networks still have limitations in terms of grounding.
Color temperature influences visual comfort and perception of urban space.
The choice of color temperature directly impacts visual comfort, the perception of the environment, the social acceptance of lighting, and the environmental impact at night.
Current projects prioritize solutions that balance energy efficiency with lighting quality and appropriate perception of public spaces.
This factor directly contributes to the feeling of organization and legibility of the urban environment.
Mechanical strength and sealing influence maintenance costs.
Municipal projects require lighting fixtures with high levels of robust construction.
Among the essential parameters are:
- IP protection rating
- IK impact resistance
- protection against electrical surges
- corrosion resistance
- thermal stability
These factors reduce maintenance interventions and increase system reliability over time.
Compatibility with remote management increases operational efficiency.
Modern public lighting projects often include dimming, remote monitoring, point-to-point control, and integration with smart city platforms; therefore, the specification must provide for compatibility with remote management systems from the design phase.
Well-structured technical specifications reduce contractual risks.
Proper specification contributes to:
- greater transparency in bidding processes
- comparability between suppliers
- performance predictability
- reduction of technical liabilities
- legal security for public managers
Furthermore, it increases the efficiency of public lighting park management throughout the system's life cycle.
Public lighting as a strategic infrastructure for cities.
Public lighting plays a fundamental role in organizing urban space and improving nighttime environments. More than just ensuring visibility, well-designed projects contribute to spatial orientation, promote urban mobility, enhance public spaces, and increase the public's perception of safety, in addition to supporting the operational efficiency of municipalities.
Therefore, technical specifications should be treated as a strategic step in the implementation of public lighting systems, ensuring adequate performance, reliability over time, and compatibility with the real needs of urban infrastructure.
At Soneres, we develop public lighting solutions considering technical, regulatory, and operational criteria compatible with the demands of municipal projects.
If you are structuring a project to modernize or expand your public lighting system, our team can support the technical evaluation of the most suitable solutions for each application.
Contact us: comercial@soneres.com.br
Reference materials
The criteria presented in this article are aligned with the guidelines of the ABILUX IP Legal Program, of which Soneres is a participating company. The program provides two support materials for municipal managers: A Guide for Mayors and Municipal Managers and the Manual for Municipal Defense in Public Lighting – Acquisition of LED Luminaires.