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Incident light reading
A measurement, by light meter, of the amount of incident light falling upon a subject. The light meter is placed close to the subject, pointing towards the main light source.
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Incident vs Reflected light and which type gives you better photos
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Incident Light
Incident Light is light coming from a light source that falls directly on a subject and provides sufficient illumination to view it.
Incident Light Meter ...

incident light meter: An incident light meter can help in difficult lighting situations. Incident light meters measure the light falling on the subject as opposed to the light reflected from it. camera meters are reflected types and can be fooled by subject's tonality.

Incident light
Light falling on a surface (as opposed to reflected by it).
(see Meter)
Incident light reading
Measurement, of the amount of incident light falling upon a subject. The meter is placed close to the subject, pointing toward the light.
(see Meter) ...

Incident light
The light actually falling on a subject, which may not be the same as the amount of light being reflected by the subject. Light falling on a surface as opposed to the light reflected by it.

Incident light.
Light falling on a surface as opposed to the light reflected by it.
Infinity. ...

Incident light attachment. Diffusing disc or dome (usually of white plastic) placed over the cell of a hand-held exposure meter to make readings towards the light source. Calculator dial is then used in the normal way. Gives results similar to reading off an 'average' subject or gray card.

Incident Light Meter (ILM)
A meter designed to read Incident Light. Compensation is needed for unusually dark or light subjects, Back Light, silhouettes, and special Exposure effects. The tool for measuring Lighting Ratio.

INCIDENT LIGHT METER - An exposure meter (generally hand held as opposed to a reflective meter that is built into a camera) that reads the amount of incident light.

Incident light meters work best when you are willing to average the exposure over the whole scene. Incident meters are most effective when the light source is shinning on you subject from nearly straight in front of your subject and not from the side.

Uneven Incident Light
Scenes with high variation in reflectivity, such as those containing black objects in addition to strong reflections, may actually have a greater dynamic range than scenes with large incident light variation.

When using an incident light meter, the most important source of error of which the photographer must be aware occurs when the light is highly directional. The incident dome may not catch the light exactly the way the combination of the subject and camera lens.

Whenever the light source has a 90-degree relationship with the camera, the incident light on the subject is called side lighting. In side lighting situations, part of the subject is in shadow.

Well it is possible to measure this way - it's called an incident light reading, instead of the reflected light reading your camera measures.

As a rule, the best way to measure incident light is to stand beside the subject and point the white dome towards the camera. This gives a good overall exposure.

To capture the reflection image, this method illuminates a wafer on a tilted wafer chuck in order to make the incident light angle and the reflection light angle equal. This reflection light is effective for detecting coating errors.

The incident light sensor is on the front behind a white dome, and it measures the light falling on the meter. A full explanation of when to use ambient versus incident light is beyond the scope of this article, but suffice it to say that this meter does both quite well.
Position it.

Although artificial room lighting (such as table or floor lamps) is intended to illuminate the room in such a way that the "incident light" bathes the entire environment equally, this is simply not the case.

ANGLE OF INCIDENCE - Light striking a surface is called 'incident light.' It becomes 'reflected light' when it reflects from the surface.

The recorded hologram is now a three dimensional structure, and it can be shown that incident light is diffracted by the grating only at a particular angle, known as the Bragg angle.

Altitude and ultra-violet rays can adversely affect exposures, particularly when measuring incident light with a handheld device. Bracket more widely than normal. A sturdy carbon-fibre tripod is essential.

Better than the gray card, the ExpoDisc Professional Digital White Balance Filter sits in front of your lens and looks similar to the dome on an incident light meter. It is available in different sizes. Buy the larger one so you can use it with all your lenses.

You might also switch to incident light meters, because they simply meter the light falling on the subject. Unlike reflective meters, the tone on the subject doesn't matter, so it will always render it properly.

The amount of light transmitted depends on the density of the medium through which it is passed and on the brightness of incident light source. Transmitted light is always less than incident light, but the amount of loss depends on the density of the medium.

Those cards are designed to reflect 18% of the incident light. So, if you point your camera at one of those cards and force you camera to use the exposure it finds for that card, you should get good exposure for whatever you place in the same place you had the card.

The Expodisc is helpful because it integrates light sources from all angles, just like an incident light meter. Slight variations of angle won't affect the color balance as it will with a card.
That's why I use an Expodisc. It's easier to carry and more durable than a white card.

As explained on the Kickstarter page, Luxi can help you improve the quality of your photos because it measures incident light, not reflected light, and thus won't get tricked into underexposing a strongly backlit subject.
Here's a brief video introducing Luxi.
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If you don't have an incident light meter or a gray card, then take a reading with your built-in meter...and bracket! ...

Transmissive light filters (e.g. colored patches of glass or plastic) stop some of the wavelengths from the incident light, only letting trough a limited range of colors.

IF (Internal Focusing) System Image Image Editor Image Plane Image Resolution Incident Light Infinity Infrared Infrared Compensation Index Inkjet Inverse Square Law IR Setting ISO
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Reflectance (of a surface) The proportion of incident light the surface reflects. (See spectral reflectance).

Primary Mirror The first mirror encountered by incident light in a telescope system. Prime Focus (PF) a) The focal point of the large primary reflecting mirror in astronomical telescopes when the light source is extremely distant.

For high-key portraits, you want all dominant tones to be white, with highlights and shape-defining shadows (as in the sweater and cheeks here) to be close to the same density-a ratio of about 1:2. A common way to assure these ratios is by taking incident light meter readings of main and fill ...

See also: See also: What is the meaning of Light, Photograph, Image, Camera, Photography?

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