Lumeitalia
Aluminium, solid graphite and technopolymers: weight, heat dissipation, durability and impact in retrofit and refurbishment of existing installations projects.
The luminaire body material drives heat dissipation, load on structures, corrosion resistance and the environmental footprint of the supply. Most projects do not start from scratch: they work on existing installations, with poles, lines and constraints already in place. This comparison examines the available alternatives for retrofit and refurbishment of existing installations with design rather than commercial criteria.
The regulatory reference for retrofit and refurbishment of existing installations is not a single document but a coordinated set of standards covering performance, safety and environmental impact. In design practice the following documents drive the main choices.
Die-cast aluminium remains the most widespread solution: good conductivity, mature process, predictable cost, but high mass and significant production footprint. Technopolymers reduce weight and corrosion, with lower conductivity that must be compensated in the thermal design. Solid graphite offers high conductivity with contained mass, reducing the load on supporting structures and the impact of the production stage.
The comparison must be made at equal required performance, considering four items: component operating temperature, total weight on the support, behaviour in the specific site environment and maintenance constraints. In retrofit and refurbishment of existing installations weight matters when existing structures were not sized for current luminaires, a recurring situation in works on historic installations.
A correct environmental assessment covers the whole cycle: raw materials, production, transport, operation and end of life. A material with a lower production footprint but shorter service life is not necessarily better; likewise, mass reduction affects transport and site handling. The ability to separate materials at end of life is a criterion that is becoming standard in public procurement.
Lumeitalia adopts solid graphite with the Cool-X® system to combine conductivity and reduced mass, keeping production in Italy and component traceability.
The difficulties that most often emerge in retrofit and refurbishment of existing installations projects are not about product selection, but about defining requirements and verifying results.
An orderly method drastically reduces variations during works and disputes at commissioning. Three choices make the difference from the earliest stages.
Non-conformities found at commissioning almost always come from three causes: requirements not declared or declared without a reference standard, calculation run on idealised geometry, and an optimistic maintenance factor. All three can be avoided at zero cost during design.
A retrofit and refurbishment of existing installations project holds up over time when requirements are declared, the calculation reproduces real conditions and on-site verification follows an agreed protocol. Component selection matters, but comes later: without measurable requirements even the best product delivers a result that cannot be demonstrated. Centro Studi Lumeitalia makes its technical office available to review requirements and design checks.
Methodological note: This content is written for technical information purposes by Centro Studi Lumeitalia and does not replace the lighting design or a full reading of the standards cited. Applicable performance values are those of the standards in force at design time.
No: replacing the luminaire improves efficiency, but compliance depends on the overall lighting result, verified by calculation.
When structural checks reveal corrosion, or when the existing geometry cannot achieve the required class.
From a written definition of performance requirements and verification conditions: this step drives every later choice and makes the result either disputable or defensible at commissioning.
Photometric files of the proposed luminaires, declaration of conformity, lifetime data declared per IES LM-80 with its conditions, the maintenance schedule and warranty terms.
