Any uses of photometer?

Question

I am doing a project in physics under the title photometer.
I would like all the information i can get about photometer,artificial lighting,shadows.
I searched the net but there are many useless links there but only some good links.
So i post this question on yahoo.
Please answer with even a line u know about photometer.
Even if it is a single good sentence i dont care

Answer 1

Photo = light;
"meter" = measurement

photometer measures light; VERY useful for professional photographers. Here's a USEFUL website:

http://en.wikipedia.org/wiki/Photometer

Answer 2

An instrument used for making measurements of light, or electromagnetic radiation, in the visible range. In general, photometers may be divided into two classifications: laboratory photometers, which are usually fixed in position and yield results of high accuracy; and portable photometers, which are used in the field or outside the laboratory and yield results of lower accuracy. Each class may be subdivided into visual (subjective) photometers and photoelectric (objective or physical) photometers. These in turn may be grouped according to function, such as photometers to measure luminous intensity (candelas or candlepower), luminous flux, illumination (illuminance), luminance (photometric brightness), light distribution, light reflectance and transmittance, color, spectral distribution, and visibility. Visual photometric methods have largely been supplanted commercially by physical methods, but because of their simplicity, visual methods are still used in educational laboratories to demonstrate photometric principles.

Answer 3

Use Of Photometer

Answer 4

It is an instrument used to measure the intensity of light. Some of its uses are to measure: illuminance, irradiance, light absorption, scattering of light, reflection o f light, fluorescence, phosphorescence, luminescence.

Answer 5

it regulates the amount of light in a room or area,. for photographic perposes,..,
good luck,.,.. thanks,...,..,