什麼是光視效能
光效衡量光源將電能轉換為可見光的效率。其定義為光通量（代表光源發出的可見光總量）與光源消耗電能之比。光效通常以流明每瓦特（lm/W）表示。
A higher luminous efficacy indicates that a light source is more efficient in producing visible light for the amount of power it consumes. This means that a light source with a higher luminous efficacy will provide a brighter output while consuming less electricity.
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The concept of luminous efficacy takes into account the spectral distribution of the light emitted by a source. It considers the ability of the light source to generate radiation within the visible wavelength range. If a light source emits more wavelengths outside the visible range, the luminous flux (visible light) will be reduced in proportion to the total radiant flux. Consequently, the luminous efficacy of the light source will also decrease.
In the lighting industry, luminous efficacy is an important parameter used to assess the efficiency and effectiveness of different light sources. It allows lighting professionals to compare and evaluate the energy efficiency and performance of various lighting technologies, aiding in the selection of the most suitable light source for specific applications.
To calculate the luminous efficacy of a light source, one needs to divide the total luminous flux (in lumens) by the electrical power consumed (in watts). For example, if a 90-watt light bulb emits 900 lumens of visible light, the luminous efficacy would be calculated as follows:
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Luminous Efficacy = Luminous Flux (in lumens) / Power Consumed (in watts) Luminous Efficacy = 900 lumens / 90 watts Luminous Efficacy = 10 lm/W
In this example, the luminous efficacy of the light bulb is 10 lumens per watt, indicating that it produces 10 lumens of visible light for every watt of electrical power consumed.
