Easy Way to Make Bulbs Last For Centuries
Why It Does Not Pay To Do So.
What Does Pay Off!
Details in the Centennial Bulb web site.
Bulbs.com has 13 incandescents having voltage ratings anywhere from 220 to 277 volts here.
I consider it a safe bet that the Livermore "century bulb" is even less than 2 percent efficient at converting electricity to visible light.
Since the cost of producing a given amount of light with incandescent lamps is usually mostly the cost of electricity rather than the cost of the light bulbs, it does not pay to make them last extremely long.
General Info by Sam Goldwasser.
Some Helpful Hints and Brand/Model-specific and application-specific advice, etc.
In office buildings, schools and hospitals, non-compact fluorescents (usually 4 feet long) are almost always used since these are more efficient than smaller sizes. Due to economies of volume production, 4-foot bulbs don't cost more than smaller sizes.
One way to minimize lighting cost is to use a smaller number of higher
wattage light bulbs instead of a larger number of lower wattage
ones. Minimize the bulb count as much as possible without making light
distribution too uneven or exceeding the ratings of the fixture. (Many
fixtures have a 60 watt bulb wattage limit!) You spend less by buying and
replacing fewer bulbs. In addition, higher wattage bulbs tend to be more
efficient than lower wattage ones - for one thing, thicker filaments can
be operated at a slightly higher temperature for a given life expectancy.
For another, with reduced per-watt bulb costs, the cost of bulbs becomes
less important (compared to the cost of electricity) for higher wattages
so higher wattage bulbs are designed to run hotter and lower wattage bulbs
are designed to last longer (which makes them run less efficiently).
Written by Don Klipstein.
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