He claimed that in 10 years, LEDs will replace at least half of the world's fluorescent bulbs, which have been the main source of workplace lighting since shortly after World War II.

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One of the main challenges faced by LED lighting manufacturers is dealing with waste heat produced by the bulb.

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As their income is cut, homes say their main costs - heating, lighting, food and staffing - are increasing.

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There were reports of violent outbreaks on the outskirts of the protest as it reached central Paris, with dozens of youths throwing bottles and lighting fires in a main shopping street.

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It is true, though, that the spread of electric lighting means many people eat their main meal of the day in the evening, when natural daylight is long gone the obverse of a mouse eating during daylight hours.

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The most notable was when the ceiling of the main floor was lowered by some eight feet and new lighting installed.

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Earlier this week, I walked into the main plenary hall as workers put the final touches on the stage and lighting.

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