Lightning risk assessment, traceable clause by clause
Pick the standard your project follows and model the structure once. The engine computes every risk component under that standard, shows the working behind each figure, and issues a report your firm signs.
What Lumex™ does
Automated risk calculation
Sphera runs IEC 62305-2:2024, AS 1768:2021 and NFPA 780-2026, each by its own method. It reproduces the IEC Annex F examples and matches the Standards Australia AS 1768 tool, apart from two values where it follows the standard's own text.
Traceable calculations
Every result carries a full trace to the clause, equation or table of the standard you chose, so you can defend each figure for clients or auditors.
Client-ready protection reports
Generate a client-ready report in minutes that cites IEC 62305-2, AS 1768 or NFPA 780 throughout. Every PDF carries your logo and firm name, and on Enterprise your colours and wording too.
Audit-ready compliance log
Every edit and approval is saved to an append-only audit log, so each assessment keeps a defensible compliance trail, whichever standard it follows.
Your regulator's numbers, not just the IEC defaults
IEC 62305-2 clause 7.3 gives 10⁻⁵ per year as a representative tolerable risk, not a fixed one.
Your authority can set its own RT and FT
Select
Pick the rules before the calculation
Choose the jurisdiction before anything is computed, so the verdict belongs to the authority that reads it. Each departure from the IEC defaults shows its clause.
Apply
A national tolerable risk carries through
Where your regulator sets its own RT or FT
Depart
Real departures, already modelled
The standard lists national practices in its own foreword. Germany fixes rp = 1. Italy judges RL1 and RL2 separately. The Netherlands and South Africa leave out Annexes D and E.
Prove
The report says which rules ran
Your report prints the jurisdiction, every departure applied and the citation for each. Any reviewer can tell a regulator's rule from a software error.
One stray formula away from a wrong number
A DIY Excel model and a rebranded Word template break right when it matters most, and nobody recalls who changed what.
Excel and Word
- A guided assessment, start to finish: A blank sheet
- The standard you work to: One sheet per standard, if anyone built it
- The lightning risk from the standard's coefficients: Typed by hand, quick to break
- Protection that brings the risk within limits: Trial and error
- Review and sign-off before issue: Files emailed back and forth
- Site data from the field: Notes and photos retyped later
- A client-ready deliverable: Re-skinned by hand each time
- Reassessment when it falls due: A calendar note, if anyone sets one
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A guided assessment, start to finish
Guided steps for each standard, from structure to verdict
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The standard you work to
IEC 62305-2:2024, AS 1768:2021 and NFPA 780-2026 built in
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The lightning risk from the standard's coefficients
A live engine that recomputes as you type
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Protection that brings the risk within limits
The smallest set of measures, recommended for you
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Review and sign-off before issue
Reviewer approval and engineer sign-off built in
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Site data from the field
Phone capture in the browser today, the Surveyor app coming soon
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A client-ready deliverable
A standard-cited
PDF, emailed to the owner from Lumex™ -
Reassessment when it falls due
Email reminders a month ahead and on the day
Purpose-built for lightning standards, from the first input
Go from a blank project to a client-ready report in four guided moves, all in the browser, with no install and nothing to rebuild at the end.
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Step 1: Describe the structure and its zones
Capture the geometry, surroundings and protection, then split the structure into risk zones, each with its own inputs.
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Step 2: Work the standard's guided flow
Guided steps for IEC 62305-2, AS 1768 or NFPA 780 resolve the risk against the tolerable limit, showing the working behind each figure.
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Step 3: Review every figure and sign off
The author checks every figure and signs off, a reviewer approves it, and each action is saved to the audit log.
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Step 4: Issue and share the client-ready report
Export the full or short PDF report, or send the building owner a secure link straight from
Lumex™
See each step in detail on how it works.
AI that explains every figure and never invents one
Lumi works inside your assessments and answers from their own calculation trace. Sphera computes every figure, and the signing engineer makes every call.
Draft review
Before you compute, Lumi reads the draft and flags inputs that look wrong or are missing, so you can fix them first.
Every figure explained
Ask how any figure was worked out, or what drives a risk. Lumi answers from the assessment's own calculation trace.
What-if reruns
Rerun an assessment with different building dimensions and see how the result moves before you commit to a design.
The least protection that passes
Lumi finds the smallest set of measures that brings each risk within its limit, by the standard's own method.
Report narrative drafted
Lumi drafts the narrative from the computed figures and your notes. You edit and approve it before anything is issued.
Your workspace, answered
List and count your projects, clients and assessments, or get a saved result summarised in plain words.
The engineer stays in control. Lumi explains, suggests and drafts. It never changes a computed figure.
YouWhat if the tower is 30 m, not 42 m?
Reading Sphera's figures
I reran it as a draft. At 30 m, risk R is lower but still above RT. Your saved result is unchanged.
YouWhat is the least protection that passes?
Testing measures with Sphera
Two measures bring every risk within its limit: LPS class III, and coordinated SPDs at the service entrance.
YouDraft the summary for the report
Drafting from the computed figures
Risk summary Draft
Tower A needs protection. With an LPS of class III and coordinated SPDs, every risk falls within its tolerable limit.
You edit and approve it before anything is issued.
Lumi uses AI and can make mistakes. Check important answers.
Sphera, straight from the standard
For the people who put their name on it
Get started today