Planned obsolescence is real, but the Centennial Light proves less than the myth claims
Published on 10 September 2026 at 04:25 GMT
By Editorial Team SDG12
The Centennial Light in Livermore, California, has become an internet shorthand for a sweeping claim: manufacturers once knew how to make products last, then began installing hidden expiry mechanisms to force repeat purchases. The lamp is real, and so is the history of companies deliberately restricting durability. Yet the evidence does not support the idea that every modern product contains a secret countdown to failure.
That distinction matters because planned obsolescence describes several different practices. It can mean physically designing a product for an artificially short life, restricting repair through unavailable parts or software, withdrawing compatibility, or encouraging replacement through style and marketing. Ordinary wear, safety trade-offs, falling performance and cheap construction can also shorten useful life without proving a coordinated plan.
The best-documented historical example is the Phoebus cartel, formed by major lamp manufacturers in the 1920s. A legal study published in the Oxford Journal of Legal Studies records that participating businesses agreed to limit bulb life to 1,000 hours and adopted corporate measures to alter filaments. The arrangement remains important evidence that commercial actors have intentionally constrained product lifespan.
Even that episode needs technical context. Incandescent lamps involve a trade-off between light output, electrical efficiency and filament life. A filament operated at a lower temperature can last longer but produces less useful light and changes the balance between illumination and energy use. Standardisation can therefore serve legitimate engineering aims, while a cartel can simultaneously suppress competing durability choices. The historical evidence establishes deliberate restriction in a particular market, not a universal rule about manufacturing.
What the Centennial Light actually shows
The Livermore lamp was donated to the local fire department in 1901 and is recognised by Guinness World Records as the oldest working light bulb. According to Livermore's Centennial Light Bulb Committee, it is a hand-blown Shelby Electric Company bulb with a carbon filament. The committee reports that it began at 60 watts, now operates at about four watts and serves as a nightlight over fire engines.
Its operation has not been literally uninterrupted. The committee records power outages, about a week switched off during a 1937 firehouse renovation, a move to another station in 1976, and a power-supply failure in 2013 that left it dark for at least nine and a half hours. It has nevertheless operated nearly continuously for much of its life.
The bulb is therefore an extraordinary survivor under unusual conditions. Its carbon filament, low present power and near-continuous operation distinguish it from modern lamps designed to provide much more light per unit of electricity. The committee says the exact reason for its survival remains a mystery. Claims that its lifespan is fully explained by one feature go beyond the available evidence.
Nor is the bulb a fair performance benchmark for contemporary lighting. A product can endure while delivering progressively less of its original function. Longevity measured only by whether a filament still glows overlooks brightness, energy consumption, colour quality, purchase price and the services expected from modern lighting. The Centennial Light demonstrates exceptional endurance, but it does not establish that today's lamps could all operate for 125 years at their expected performance.
Repair restrictions provide a clearer modern test
Evidence about present-day durability is often stronger when it concerns repair. In its 2021 report to the United States Congress, the Federal Trade Commission examined restrictions including adhesives that complicate component replacement, limited access to parts and tools, unavailable diagnostic software, and product designs that make repairs less safe or practical. The agency found scant evidence to support manufacturers' justifications for many restrictions, while also recognising that safety, cybersecurity and intellectual-property concerns can be legitimate in particular cases.
Such restrictions do not necessarily prove a secret failure date. They can still shorten a product’s useful life by making a minor defect uneconomic to fix. The consumer experiences the result as premature replacement even when the original design did not specify the moment of failure. This is why debate has shifted from searching for hidden timers towards measurable questions: whether batteries can be replaced, spare parts can be obtained, software remains supported, and independent repairers can access tools and information.
Policy has followed that shift. Under the European Union's Directive on common rules promoting the repair of goods, Member States were required to apply national implementing measures from 31 July 2026. For product groups already covered by EU reparability requirements, those measures require manufacturers to repair covered goods within a reasonable time and for a reasonable price. They also restrict contractual, hardware and software techniques that impede covered repairs unless legitimate and objective factors justify them. The rules do not declare all short-lived goods fraudulent; they address defined obstacles to keeping specified products in use.
The environmental stakes extend beyond household frustration. The International Telecommunication Union and United Nations Institute for Training and Research estimated that the world generated 62 million tonnes of electronic waste in 2022, of which 22.3 per cent was documented as formally collected and recycled. Product lifetime is only one influence on that total, alongside consumption growth, access to collection and recycling systems, and the rapid expansion of electrical and electronic equipment.
This connects the debate to SDG 12 (responsible consumption and production), which includes reducing waste generation through prevention, reduction, recycling and reuse. Longer use and viable repair can contribute to that target, but durability alone is not a complete environmental measure. A long-lived product that consumes excessive energy or performs poorly may carry different costs from an efficient product with replaceable components.
The strongest conclusion is narrower than the popular conspiracy. Deliberate lifespan restriction has occurred, and contemporary repair barriers are documented. At the same time, product failures arise from mixed causes, including engineering compromises, materials, price pressure, usage, maintenance and software change. The Centennial Light is a compelling historical object, not a universal control experiment. Scrutiny is most credible when it focuses on evidence that can be tested: design choices, repair access, support periods, performance over time and the rules governing manufacturers.
Written by a human author, edited with AI assistance.
Further information and Youtube credits:
● Oxford Journal of Legal Studies, “Planned Obsolescence in the Context of a Holistic Legal Sphere and the Circular Economy”, supports the account of the Phoebus cartel and definitions of planned obsolescence.
● Livermore's Centennial Light Bulb Committee, “Centennial Light Facts”, supports the lamp's history, construction, interruptions and present power.
● US Federal Trade Commission, “Nixing the Fix: An FTC Report to Congress on Repair Restrictions”, documents common repair restrictions and assesses manufacturers’ explanations.
● EUR-Lex, “Directive (EU) 2024/1799 on common rules promoting the repair of goods”, provides the directive's scope, repair obligations and application date.
● International Telecommunication Union, “Global E-waste Monitor 2024”, supports the global electronic-waste figures and documented recycling rate.
● Youtube credits: https://www.youtube.com/@CityofLivermoreCalifornia
