The same trick, applied twice
Spec inflation in portable lighting usually arrives in one of two forms. The first is a lumen figure with no test conditions behind it, so large by comparison that it outranks every competitor on the page. The second is an ingress marking with no declared test condition, so generous that it appears to make the product safe in any weather. The two are not independent failures. They are the same commercial move applied to two different parameters, and a buyer who recognises the move can stop paying for it.
This article is the site's position on both. It is written as a comparison of how each parameter is inflated, and as a statement of what the buyer should request instead.
How the lumen figure is inflated
A lumen figure is a measurement result, not a property of the product, and it moves with the machine, the distance, the drive current, the ambient temperature and the mode it was measured in. Inflation happens when those conditions are omitted, because a figure without conditions can be chosen from the favourable setting.
The common versions are familiar. A figure taken at the highest drive current with a cold sample reads higher than the same product after it has warmed. A figure taken at a close detector distance reads higher than the same product measured farther away. A figure that is the sum of several modes reads higher than the single mode the buyer will actually use. None of these is a lie. Each is a measurement of something real, described in a way that implies more than the product delivers.
The counter is not to refuse every figure. It is to require the conditions to travel with the figure. Lumens without test conditions sets out the eight-row condition table, and the mechanics of spec inflation sets out the commercial pressure behind the practice.
How the ingress marking is inflated
An ingress marking describes a test: the water or dust that was applied, the duration, the pressure and the condition of the product during the test. Inflation happens when the marking is presented without those conditions, or when the marking is read as broader than the test supports.
The phrase that signals the problem is an unconditional claim to be impervious to water. It is the same claim at every price point, and it carries no condition, no duration and no recovery step. A product may be tested against external water under declared conditions and still not be described as unconditionally impervious to water, because the conditions are the whole content of the claim.
The second problem is the headline grade. A specific grade is a result for a specific procedure, and it is often quoted as though it were a property of the product. Two products with the same grade can have been tested at different durations, under different water conditions and on different sample states. The grade alone does not carry the comparison.
What this site does instead
The site's rule is simple and it applies to every article in this set. Unconditional claims of imperviousness to water are not used. Specific ingress grades in the body are not used either, because a grade quoted without its condition is a claim without content.
The language used instead is a phrase that carries the condition: IP-rated with declared test conditions, ingress-rated, or weather-tested. Each of these phrases points the reader to a condition that should be stated. The phrase is not a weaker claim; it is a more honest one, because it is a claim that survives comparison.
Unconditional claim vs conditioned claim
| Unconditional phrasing | What it omits | Conditioned phrasing | What it points to |
|---|---|---|---|
| Unconditional claim of imperviousness | The test, duration and recovery | IP-rated with declared test conditions | The stated external-water procedure |
| Fully sealed | The pressure and time | Ingress-rated | The specific ingress procedure |
| Survives any weather | The conditions and the sample state | Weather-tested | The stated weather simulation |
| A specific headline grade alone | The duration and sample state | A grade with its declared conditions | The procedure that produced the grade |
| Spill-proof | The liquid, the angle and the time | Ingress-rated against liquid | The liquid-ingress test |
A headline figure ≠ a comparable claim
A lumen figure is not a promise. It is a measurement at conditions, and a buyer who accepts a figure without the conditions is accepting a claim that cannot be compared.
An ingress marking is not a guarantee of dryness inside. It covers external water under declared conditions, and it does not describe internal condensation, corrosion resistance or durability. IP-rated ingress claims and the condensation gap covers that boundary and defines the related vocabulary.
A third boundary: an unconditional claim of imperviousness is not a stronger claim than a conditioned one. It is a claim with fewer facts attached, and a buyer should treat it as a reason to request the test conditions rather than as reassurance.
Five questions for the supplier
- What test conditions were used for the lumen figure, including machine type, mode, distance, drive current, ambient temperature and warm-up? The figure is only comparable with its conditions.
- Which brightness mode does the headline figure belong to, and is it the highest, the mid or a combined figure? A combined figure is not a setting the user can select.
- What ingress procedure was applied, for how long and under what conditions, and can you send the test-condition sheet? The marking should travel with the condition.
- Does the marking you quote appear as a specific grade, and if so, what conditions accompany it? A grade without conditions is a claim without content.
- Will you state the conditions on the quotation rather than after the order, and will you repeat the same conditions at sample approval? A supplier with the document answers quickly.
Next step
Request the condition sheet for every figure on the quotation, keep it beside the comparison table, and refuse to compare two figures whose conditions do not match. Then ask the same at sample approval. Related reading: the mechanics of spec inflation for why the practice persists, lumens without test conditions for the eight-row condition table, and IP-rated and ingress terms for the vocabulary this article uses. To hold a quotation to these conditions, start at contact.
Part of the Lumizuno outdoor-lighting notes. Illustrative values only; lumens and ingress ratings must be read with their test conditions.