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Its estimated lifespan of 50,000 hours is about 25 times that of a conventional bulb.
It sells for three times the cost of a conventional bulb.
(A conventional bulb converts only 5percentt of the energy it uses into light; the rest is released as heat).
The cut-off bottoms of plastic milk jugs take up much less storage space than conventional bulb pots.
The technology is disarmingly simple – a plastic bottle filled with bleached water installed in the roof of a building so that daylight from outside refracts through the water into the room, providing equivalent brightness to a 50-watt conventional bulb in full daylight.
The death warrant of the conventional bulb was signed by EU leaders in 2007 to help meet climate change targets, but other countries have been thinking about it too.
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In Minnesota, an official said there had been snow-packing problems even with conventional bulbs.
Because SolarCaps use light-emitting diodes, or L.E.D.'s, instead of conventional bulbs, they require no maintenance or wiring.
The exit bulbs go for $6.99 and the household lamp, sold through mail-order catalogues, is $4.99, five or six times what conventional bulbs of similar strength cost.
But they do not emit nearly as much heat as conventional bulbs, allowing snow and ice to accumulate more easily in certain conditions.
Conventional bulbs have changed little in a century because they are cheap, convenient and do an excellent job of shedding light.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com