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Several measures of light are commonly known as intensity: . Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr); Luminous intensity, a photometric quantity measured in lumens per steradian (lm/sr), or candela (cd)
Quantity Unit Dimension [nb 1]Notes Name Symbol [nb 2] Name Symbol Luminous energy: Q v [nb 3]: lumen second: lm⋅s : T⋅J: The lumen second is sometimes called the talbot.: Luminous flux, luminous power
A Colortran ERS. An Ellipsoidal Reflector from a Leko Source Four ERS. Ellipsoidal reflector spot (abbreviated to ERS, or colloquially ellipsoidal or ellipse) is the name for a type of stage lighting instrument, named for the ellipsoidal reflector used to collect and direct the light through a barrel that contains a lens or lens train.
Intense pulsed light is the use of intense pulses of non-coherent light over a range of wavelengths from 500 nm to 1200 nm. [10] Xenon flashlamps produce high output bursts of broad spectrum. Cooling is used to protect the skin in contact with the device. [11] Regulations governing IPL vary by jurisdiction.
Retinitis pigmentosa (RP) is a member of a group of genetic disorders called inherited retinal dystrophy (IRD) that cause loss of vision. [1] Symptoms include trouble seeing at night and decreasing peripheral vision (side and upper or lower visual field). [1]
This arc generates intense heat and excites the gases and metal additives within the tube. As the excited atoms return to their ground state, they release energy in the form of light. Spectrum Emission: The specific spectrum of light emitted depends on the energy levels of the excited atoms and the properties of the metal additives. Each metal ...
This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
Tyndall scattering, i.e. colloidal particle scattering, [7] is much more intense than Rayleigh scattering due to the bigger particle sizes involved. [citation needed] The importance of the particle size factor for intensity can be seen in the large exponent it has in the mathematical statement of the intensity of Rayleigh scattering.
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