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fixture, holds a lamp/bulb |
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"60-watt" used to mean a specific brightness. watts no longer parallel brightness |
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wave-like, separate energy packets (quanta) |
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radiation, radiance, radiant flux |
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radiometry (units: watts, joules) |
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visible light measurements |
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light production, measured in candelas |
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light moving or flowing through air |
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illuminance, illumination |
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light striking an object being visible |
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how well electrical energy is converted to light by a particular technology (measured in lumens per watt) |
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how much light comes out of a luminare, available for illuminating things |
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precise color measurement of light. measured in degrees kelvin |
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lamp efficacy (energy efficiency) discounted for strongly colored light, which does not produce as good visibility as near-white light |
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light obstructing night visibility or telescopes |
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ecological light pollution |
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light that confuses, disrupts, or harms biological ecosystem functions |
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light that violates property boundaries and irritates neighbors |
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