Još jedan prilog temi kratkog trajanja običnih žarulja: Planned Obsolescence is the deliberate shortening of product life spans to guarantee consumer demand.
i onda detaljni članak na
http://en.wikipedia.org/wiki/Phoebus_cartel koji preporučam u cijelosti.
The cartel served as a convenient way to lower costs and worked to cap the life expectancy of light bulbs at 1000 hours,[3] while at the same time hiking prices without fear of competition. Members' bulbs were regularly tested and fines were levied for bulbs that lasted more than 1000 hours...
The cartel claimed that 1000 hours was a reasonable optimum life expectancy for most bulbs, and that a longer lifetime could be obtained only at the expense of efficiency: more electricity is wasted as heat and less light is obtained
Ima i dokumentarac ali nisam pogledao još.
http://topdocumentaryfilms.com/light-bulb-conspiracy/