Photocells


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Photocells

A light-sensing device used to measures the amount of incident light present in a space and activate controllers at dawn or dusk.
References in periodicals archive ?
In environments where these reguirements are addressed, the photocell option offers one of the safest and most efficient solutions.
Photocells were added to allow daylight dimming and high-end trim dimming to reduce energy use.
New light standards are being installed across the borough which already have light sensitive photocells.
Council chiefs say a new photocell would be needed to switch off lights at night.
If one assumes that the holes as well as the beams' cross-sections are rectangular and the illuminations homogeneous, then the current [I.sub.hom] produced by either of the photocells will be proportional to the breadth b of the light spot measured on the surface of the photocell when the axle is rotating, i.e., [I.sub.hom] ~b.
To do this, Photocells are used in conjunction with occupancy sensors, which shut lights off when rooms are empty, and electronic sensor control provides the maximum energy efficiency for lights.
The official explanation from the results service said that Walsh's finish time was changed ``due to water projection in the starting photocells just before the start'', while Lefevre finished his run ``under the automatic camera so his time was taken manually''.
We installed photocells in all of our exterior lighted areas as well as our interior common hallways.
The light phenomenon, also known as aurora borealis, is detected by photocells linked to a computer, which automatically notifies subscribers by sending an SMS text message to their mobile phones if the lights are visible.
For applications up to 60 products per minute per lane, photocells determine the position of the product and operate a sequence of lifting mechanisms to lift the product off the continuously running feed belts in order to correct the position of the product relative to the converging unit.
The CdS Photocells tense light in the spectral range from 515 to 730 nm, have a peak wavelength of 515 nm, and feature glass window and plastic coating construction.