luminous efficacy معنى"luminous efficacy" أمثلة على "luminous" معنى "efficacy" معنى "efficacy" معنى "luminous" معنى "efficacy study" معنى "efficacy trial" معنى "self-efficacy" معنى "vaccine efficacy" معنى "luminous exitance" معنى "luminous flame" معنى "luminous flux" معنى "luminous intensity" معنى "luminous paint" معنى "luminous sheet" معنى "luminous stick" معنى "luminous blue variable" معنى "luminous blue variables" معنى "luminous efficiency function" معنى "luminous flux unit" معنى "luminous infrared galaxy" معنى "luminous intensity unit" معنى "luminous red nova" معنى "luminosity function (astronomy)" معنى "luminosity" معنى أمثلة 1913 Irving Langmuir discovers that inert gas could double the luminous efficacy of incadescent lightbulbs.
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