http://www.bbc.co.uk/news/technology-22106718
Lighting company Philips has developed an LED lamp that it describes as "the world's most energy-efficient".
It said the prototype tube lighting LED is twice as efficient as those currently used in offices and industry around the world but offers the same amount of light.
Being able to halve the amount of energy used could bring huge cost and energy savings.
Lighting accounts for more than 19% of global electricity consumption.
The prototype tube lighting produces 200 lumens per watt (200lm/W) compared with 100lm/W for equivalent strip lighting and 15lm/W for traditional light bulbs.
In the US, for example, such lighting consumes around 200 terawatts of electricity annually. Swapping to the energy-efficient lamps could save $12bn (£7.8bn) and stop 60 million metric tonnes of carbon dioxide from being released into the atmosphere, according to Philips.
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