Lumeitalia
Method, tools and priorities in lighting design for retrofit and refurbishment of existing installations, in Q&A format.
Conversation with the Centro Studi Lumeitalia technical desk on design method. Most projects do not start from scratch: they work on existing installations, with poles, lines and constraints already in place. The answers concern working method, not specific products.
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.
From a page of written requirements. It sounds trivial, but the difference between a project that holds and one that generates variations is almost always there: what the installation must do, under which conditions, how it is verified. The calculation software comes later and does not replace this stage.
Less than people think, if the requirements are right; a great deal, if the previous stage went wrong. A well-chosen luminaire on wrong requirements produces an installation that does not serve its purpose. We prefer to spend time verifying assumptions rather than comparing datasheets.
In retrofit and refurbishment of existing installations the recurring difficulty is assessing the real condition of poles, lines and boards before replacing luminaires. It is not solved with installed power but with distribution and verification of real operating conditions. When it is addressed during the survey stage, the rest of the project flows.
Three pieces of information: who will use the space and for which activities, who will maintain the installation and how often, and which constraints are non-negotiable. With these three answers the design is set correctly; without them, work proceeds on implicit assumptions that surface once the works are finished.
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.
