Documenting variants so a colour or size change does not hide a real difference

Variants are easy to define badly. A brand may call lamps variants because they share a name and a look, while hiding that one is twice the size, uses a different bulb, and runs far hotter. A good variant definition starts with the features that affect safety, such as size, bulb type, shade material, and ventilation, and groups lamps together only when those features are genuinely the same or closely similar.

Colour alone rarely creates a meaningful variant difference, while size often does. A larger lamp may trap more heat, need a stronger base for stability, and use a shade that sits closer to a hot bulb. The variant table should therefore treat size as a safety feature, not as a marketing option, and should flag any size change for separate consideration.

A variant table is the heart of variant documentation. For each lamp size, the table should list dimensions in general terms, bulb type, shade material, base weight and stability, and heat behaviour, side by side, so differences jump out. A reader should be able to see, without hunting through separate files, that the large lamp differs from the small lamp in heat and stability, even if they share a name and a design language.

The table should also state, for each variant, what was tested and what was carried over from another variant, with reasons. If the small lamp was tested for stability, but the large lamp was not, the table should say so plainly, rather than implying that a small lamp result covers a large lamp by association.

Illustration: a brand sells lamps in 30 size and fabric combinations and imagines that 20 of them, in round illustration terms, share a shade material that behaves differently when hot. Those figures, as presented in Documenting variants so a colour or size change does not hide a real difference, are invented, not measured. They show why a variant table must include materials, not only sizes: a fabric change can affect heat and flammability in a way that a size table alone would miss.

The brand should therefore add a material column to the table, and should test or assess each material combination that affects safety, rather than assuming that a shade fabric proven for a small lamp is automatically suitable for a large, hotter lamp.

Traceability for variants means that a complaint, a test result, or a batch can be tied to a specific variant, not merely to a lamp range. The brand should use variant codes on packaging, in production records, and in the file, so a report about a large lamp overheating does not get filed against the small lamp's record by mistake.

• Define variants by safety features, size, bulb, shade, and ventilation.
• Build a side by side table showing differences for each variant.
• State what was tested per variant and what was carried over, with reasons.
• Use variant codes on packaging, production records, and the file.

Variant documentation often fails by filing one variant and assuming the rest. A brand that files a thorough record for the medium lamp, and then sells small and large lamps with no additional record, has documented one product while selling three. Each variant that differs in a safety feature needs its own entry, even if that entry is short and largely refers back to the main record.

Another failure is to let marketing drive variant grouping. Lamps grouped by colour family or collection name may hide a size or bulb difference that matters for safety. Variant grouping should follow safety features first, and marketing families second, with the safety grouping clearly visible in the file.

Close by reviewing the variant table whenever a new size, shade, or bulb is added. Each addition should get a row in the table, a safety feature comparison, and a testing decision, before it is sold, not after a complaint reveals a difference.

Keep old variant rows visible when a variant is discontinued, so a later complaint about an old lamp can still be traced to its table entry, its tests, and its materials, rather than to a range name that no longer exists.