The standard measure of light radiation. (For example, one candle emits 12.5664 lumens).
A lumen is a measure of the amount of light produced by a lamp, the light coming out of the lamp. A lamp's light output rating expresses the total amount of light emitted in all directions per unit time. Ratings of initial light output provided by manufacturers express the total light output after 100 hours of operation.
A unit of measure for light output submitted by Fish Newb The lumen can be thought of casually as a measure of the total "amount" of visible light emitted. submitted by Rex Grigg
A measurement of illumination on a screen or other surface. 1 Lumen/m2 = 1 Foot-candle. M–O
The total amount of light emanating from a light source.
The unit of measure for the light output of a projector.
Unit of measure for total light output.
An industry term loosely used as a measure of brightness. The larger the audience size, the greater the lumens a projector should have in order for the projected image to be optimally visible. Very roughly, with the lights full on, a projector of 800 lumens can handle an audience up to 50 people, while a 5000-lumen unit is bright enough for up to 1000 people.
Is a measurement of the flow of light (Brightness). As a rule of thumb the higher the number the brighter the image. This can be useful when using a projector in a room that has a light source other than the projector (table lamp etc.)
The amount of light a bulb produces.
Lumens is the unit of measure for projector brightness. It is the unit of luminous flux representing a definite rate of light emission. Luminous flux denotes the time-rate flow of light energy, that characteristic of radiant energy which produces visual sensation.
A measurement of light intensity. (1 lumen=10.76 lux).
Standard unit used for measuring brightness.
A unit of luminous flux; overall light output; quantity of light, expressed in lumens. For example, a dinner candle provides about 12 lumens and a 60-watt soft white incandescent lamps provides about 840 lumens.
this is a measure of light output from a source, measured in candlepower. Each lumen represents the brightness of one candle.
A measure of brightness of projectors. Typical LCD projector brightness ranges from 1500 to 10,000 lumens.
This is an empirical measure of the quantity of light. It is based upon the spectral sensitivity of the photosensors in the human eye under high (daytime) light levels.
The measure of visible light output. Lumens is the brightness of a light bulb.
The Standard International unit of measure of the luminous flux of light.
The scientific explanation is quite esoteric but lumens are essentially a measure of brightness. In our test all but one projector is capable of a 2,000 lumens brightness or better - this is at the high-performance end of semi-portable or portable projectors. Advantages of this high brightness are the ability to handle more ambient light in a room and to produce a bigger image onscreen without a significant loss of image quality.
A measurement of light output ; takes into account the eye sensitivity curve of humans and gives more weight to the yellow-green part of the light spectrum that is most effective for human vision
The quantity of light emitted by a lamp.
Unit of light measurement typically for projectors.
A unit of measurement for the amount of light that a bulb puts out. Example: common light bulbs emit approximately 170 candela per 10 watts of electricity.
The actual quantity of light produced by a lamp or other source. From the Latin word 'lumen' which means 'light'. Correctly known as luminous flux. (See Luminous Flux).
