Illuminance provided initially by a lighting installation will decrease in a gradual way during its use due to a reduction in lamp lumens, to lamps which burn down, and to accumulation of dirtiness in lamps, luminaires and surfaces of the room. However, it is possible to maintain illuminance at or above the minimum permitted value …
Architectural Luminaires – Unusual Visual Effects
Architectural luminaires are custom-designed and built fixtures that offer features not available in commercial luminaires. They can be built to fit specific locations or perform desired functions as well as provide unusual visual effects. These luminaires can be made from wood, metal, or plastic decorative elements and they can include standard lamp sockets, lampholders, wiring, …
8 aspects of potentially health dangerous CFL bulbs
Introduction to Compact Fluorescent Light (CFL) We are becoming more conscious about climate change and many governments in the world are looking for different ways to reduce greenhouse gases and to reduce consumption of fossil fuels. One of the simplest solution for this is aggressively adopting CFL which is phasing out energy inefficient light. They …
Light Detector – Under The Hood
Detectors of electromagnetic radiation in the spectral range from ultraviolet to far infrared are called light detectors. From the standpoint of a sensor designer, absorption of photons by a sensing material may result either in a quantum or thermal response. Therefore, all light detectors are divided into two major groups that are called quantum and …
Luminous Measurement Graphic Representation
The collection of luminous intensity emitted by a source of light in all directions is known asluminous distribution. The sources of light used in practice have a more or less large luminous surface, whose radiation intensity is affected by the construction of the s ource itself, presenting various values in these scattered directions. Special devices …
The Physics of Light
Man has always been fascinated by light and has constantly striven to unravel its mysteries. History has produced various theories that today strike us as comical but were seriously propounded in their time. For example, since no connection could be discerned between a flame and the object it rendered visible, it was at one time …
Basic parameters used in lighting you should know
Luminous flux Abbreviation: φ phi Unit: lm lumen The luminous flux describes the quantity of light emitted by a light source. The luminous efficiency is the ratio of the luminous flux to the electrical power consumed (lm/W). It is a measure of a lamp’s economic efficiency. Luminous intensity Abbreviation: I Unit: cd candela The luminous …
Illuminance recommendations
Recommended minimum illuminances (E) for typical interior lighting tasks. The illuminances are aimed at a lighting level appropriate to the specific visual tasks to be performed in the space or in a part of the space. They do not include architectural lighting components or other aspects for the specific situation. The average horizontal illuminances quoted …
Visibility and visual performance of good lighting
Human beings need to be informed about their surroundings in order to perform their activities in an easy and harmless fashion. Most information about the environment reaches human beings through their eyes. Therefore, it is of a visual nature. The term visibility (of an object) is used as a measure of easiness, fastness and precision …
Technical analysis of LED light
A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. Each diode is about 1/4 inch in diameter and uses about ten milliamps to operate at about a tenth of a watt. LEDs are small in size, but can be grouped together for higher intensity applications. LED fixtures require a driver …
