light and its effects
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Today light is normally produced by electricity, either by heating metals as in a filament lamp or by making gases glow as in a gas filled tube. ... The big difference is that the gas filled tubes are much colder than the filament lamps, and so are much more efficient – less energy is wasted as heat.
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Today light is normally produced by electricity, either by heating metals as in a filament lamp or by making gases glow as in a gas filled tube. ... The big difference is that the gas filled tubes are much colder than the filament lamps, and so are much more efficient – less energy is wasted as heat.
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