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measures of light are commonly known as intensity: Radiant intensity, a radiometric quantity measured in watts per steradian (W/sr) Luminous intensity, a photometric...

High-intensity discharge lamps (HID lamps) are a type of electrical gas-discharge lamp which produces light by means of an electric arc between tungsten...

In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle...

'A' lamps (light bulbs) which are generally less costly than reflector lamps. Downlights can be incandescent, fluorescent, HID (high intensity discharge)...

efficiency varies with the frequency of the light being converted, light intensity, temperature, and proportion of carbon dioxide in the atmosphere, and...

whether light intensity affected the period of the circadian rhythm. To examine this, Aschoff and colleagues manipulated the intensity of light from outside...

frequency—regardless of the light's intensity or duration of exposure. Because a low-frequency beam at a high intensity does not build up the energy...

pupillary light reflex (PLR) or photopupillary reflex is a reflex that controls the diameter of the pupil, in response to the intensity (luminance) of light that...

if light intensity stays the same for the entire 24 hour period. In the past, biologists have used lux or energy meters to quantify light intensity. They...

at a distance x from the light source, the light intensity received is proportional to 1/xn. None (n = 0) – The light intensity received is the same regardless...

analyzed using the intensity or photon autocorrelation function (also known as photon correlation spectroscopy – PCS or quasi-elastic light scattering – QELS)...

intensity of lamps and the person's skin pigment and sensitivity. About 1% of the human population has vitiligo which causes painless distinct light-colored...

absorbance. Photodiodes are often used for accurate measurement of light intensity in science and industry. They generally have a more linear response...

emanating from a scene; that is, the intensity of light in a scene, and also the precise direction that the light rays are traveling in space. This contrasts...

astronomy, a light curve is a graph of the light intensity of a celestial object or region as a function of time, typically with the magnitude of light received...

Exercise intensity refers to how much energy is expended when exercising. Perceived intensity varies with each person. It has been found that intensity has...

fc, lm/ft2, or sometimes ft-c) is a non-SI unit of illuminance or light intensity. The foot-candle is defined as one lumen per square foot. This unit...

lights would indicate the difference in intensity (e.g. a light twice as far would be four times the intensity). Ritchie's photometer depends upon equal...

correlation between light intensity and photosynthetic rate. It is a plot of photosynthetic rate as a function of light intensity (irradiance). The PI...

colour temperatures and spectral outputs from the grow light, as well as varying the intensity of the lamps. Depending on the type of plant being cultivated...