Lumens measure the total amount of light emitted by the source, while lux measures the amount of light that falls on a particular area. Lux is more accurate than lumens when measuring the effectiveness of bike lights because it considers the distance between the light source and the object being illuminated. However, the narrow beam angle light will have a higher lux output and will effectively illuminate the road ahead at a distance. The light will appear less bright when measured in lumens but will effectively illuminate the road ahead at a distance.įor example, a bike light with a wide beam angle of 120º may have a 1,000 lumens output, while a bike light with a narrow beam angle of 20º may have 500 lumens output. This results in a higher lux output but a lower lumen output. On the other hand, a bike light with a narrow beam angle will have a smaller illuminated area but a more concentrated and focused beam of light. However, this wider beam angle means the light is less focused and less intense, resulting in a lower lux output. A wider beam angle spreads the light over a larger area, producing higher total lumens output. The beam angle of a bike light determines the illuminated area’s size and the light’s intensity, which ultimately affects the lux and lumens output.Ī bike light with a wide beam angle will have a larger illuminated area and appear brighter when measured in lumens. Lumens describe the total amount of visible light emitted by a light source, while lux measures the amount of light that falls on a particular area. The diagram below illustrates the meanings of these different terms: luminance (measured in nits, candela/m 2), luminous intensity, luminous flux (measured in lumens), and illuminance (measured in lumens/m 2, aka lux).The beam angle of a bike light can significantly impact the light’s lux and lumens. Lux is an essential consideration for interior lighting design for spaces where humans live and work. Illuminance refers to the amount of light that shines onto a surface, measured in lumens per square meter (lm/m 2), also called lux. Luminous intensity is a measure of the light that shines from the source in a given direction. ![]() We quantify luminous flux in units of lumens (lm), a photometric unit of measurement. Luminous flux is a measurement of the total amount of light a light source emits, integrated over the entire angular span of the light. The amount of light emitted from or reflected off an object is called its luminance-commonly referred to as brightness. They are described by their energy or, inversely, by their wavelength. The radiation of light is made up of sub-atomic particles (photons), which have no mass but are simply carriers of energy. b. Electromagnetic radiation of any frequency or wavelength.īeyond this basic definition, we have tools and language to precisely describe, quantify, and analyze the electromagnetic waves (visible and invisible) that are all around us, emanating from the sun, from flames, and from artificial sources such as light bulbs. ![]() a. Electromagnetic radiation that is visible, perceivable by the normal human eye as colors between red and violet, having frequencies between 400 terahertz and 790 terahertz and wavelengths between 750 nanometers and 380 nanometers. Also called visible light. The American Heritage Dictionary tells us:
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