Diffuse light: Lighting source with uniform energy all over its surface. The lighting tends to be more compensated when it hits the subject surface.

Diffuse lightbulb

Backlighting provides an area of uniform illumination, oriented behind the object of interest, primarily for creating a part silhouette of instant contrast.

Workers at a warehouse need to spot oncoming vehicles, pedestrians, slippery floors and other hazards in time to prevent injuries and accidents.  Areas of the warehouse that require lighting include the loading dock, shipping and receiving areas, open storage areas, and rack storage. There are four types of lighting commonly seen at warehouses: Fluorescent (white); Metal Halides (bluish white); High Pressure Sodium (emits amber/golden light); Natural Light (e.g. skylights).

Contrast is the relationship between the brightness of an object and its background.  The greater the contrast of an object with its background, the higher its visibility.  Up to a point, higher levels of illumination may compensate for poor contrast.

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The quantity of light can be measured through the use of a light meter at the point and in the plane (horizontal or vertical) that the task is performed.  The quantity of light in the vertical plane (as opposed to horizontal) is important when items are stored on stacks.  Lighting levels are measured in lux (lumens per square meter) or footcandles (fc) (lumens per square foot).

Diffuse lightphotography

Diffuse light and soft light are not the same. When we talk about soft lighting we are talking about soft shadows. When we mention diffuse light we are talking about the distribution of the light, equally distributed along its surface.

Diffraction refers to various phenomena that occur when a wave encounters an obstacle or a slit. It is defined as the bending of light around the corners of an obstacle or aperture into the region of geometrical shadow of the obstacle.

If the lighting source is bigger than the subject and it's placed near of it, the light beam will get curved a lot generating soft shadows.

Lumen is the most common measurement of light output from a lamp.  The lumen output of a lamp depends on the lamp type and its wattage.  As lamps and fixtures age and become dirty, their lumen output decreases.

Lux is the SI (International System or metric) unit of illuminance received by a one square meter surface one meter from a source of intensity (1 lux=1 lumen/square meter).  One lux is equal to approximately 0.09290 footcandles.

If a big lighting source is placed very far of the subject, its size will be altered in relation with the subject, and its behavior will be the same as a small lighting source, generating hard shadows. The most common example of this is the sun. It is very far but still generates hard lighting. Only on cloudy days the sun lights gets diffused by the clouds.

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Footcandle (fc) is an IP (inch-pound) unit of illuminance or illumination received by a surface at a distance of one foot from a source of intensity (1 footcandle=1 lumen/square foot).

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“Dark surfaces absorb light and light-colored surfaces reflect light.  White paint reflects about 80% of the light that strikes it, while concrete or wood may reflect only 20-40%…The simple step of specifying light-colored ceiling surfaces and structural elements will vastly improve both lighting efficiency and lighting quality.”

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A comprehensive lighting maintenance program should be instituted and carried out at a warehouse on a regular basis to address the following:

The main difference between hard light and soft light do not eradicate in the light itself but in the shadows. When the shadow is perfectly defined and opaque we talk about hard light. When the shadows are diffuse we called it soft lighting, the shadows will also be less opaque.Is there any specific lighting source that creates hard or soft lighting? The answer is no. Any light can create hard or soft lighting depending on two factors.

“While a lighting survey can be conducted to evaluate the effectiveness of illumination, interviews may also be necessary to determine the existence of a safety or health problem [that may be related to poor lighting]. Interviews should solicit signs and symptoms such as eye fatigue, eye strain, headaches and a history of safety problems such as incidences of falling, tripping, or bumping.”

Glare is any reflected brightness (from a surface or unshielded light source) that interferes with visual performance and visibility and may be accompanied by discomfort.  Glare may limit a person’s ability to perform a task (disability glare) safely and accurately.

If the size of the lighting source is smaller than the object or it is placed far away from it, the light beam won't bend creating very hard and defined shadows.

The federal Occupational Safety and Health Administration’s (OSHA) does not have a general standard for normal ambient lighting.  However, OSHA’s standard on Maintenance, safeguards, and operational features for exit routes (29 CFR 1910.37) specifies that “Each exit route must be adequately lighted so that an employee with normal vision can see along the exit route” and “in proper working order at all times.”  In addition, OSHA’s standard on Powered Industrial Trucks (29 CFR 1910.178) contains safety requirements  for the use of fork trucks, tractors, platform lift trucks, motorized hand trucks, and other specialized industrial trucks powered by electric motors or internal combustion engines.  Section (h)(2) states “Where general lighting is less than 2 lumens per square foot, auxiliary directional lighting shall be provided on the truck.”

Diffused lighting interior design

Supplementary luminaires would be appropriate in places where tasks, such as loading into a trailer, may require more lighting than that which is consistently and permanently provided.  “The supplementary light should be adjustable to direct light where it is needed and to minimize glare.”

Appropriate light levels depend on type of work and a variety of characteristics of the work environment.  The following chart gives lighting levels recommended by IESNA Lighting Handbook for warehouses depending on the level of activity and the size of the labels.  The activity involves identifying and selecting a variety of large to small items – moving them on and off shelving, pallets or other storage racks.  Labels may be used to mark aisle locations or placed on the stored items for coding purposes.  Reading information on the labels is one task; some labels may use color coding for identification.

Some states have adopted specific standards for illumination in workplaces.  The California standard on Illumination (Title 8, Section 3317) states that:

“Scientists have long known that light plays an important role in regulating the human body’s daily biological rhythms—also known as circadian rhythms—including the sleep-wake cycle, alertness, and hormone production.” LRC studies human response to light, discovers evidence of mechanism leading to melatonin suppression.

Specular light: Lighting source very powerful in the center that gradually loses energy toward its extremes. Like a traditional torch. It generates very exposed and bright areas in the subject. Like the lights used in photo calls and interviews.

Proper maintenance would reduce deterioration of equipment; promote safety; keep lighting performance within design limits; and reduce electrical load and capital costs.  Employers should maintain minimum illumination levels to ensure safe working conditions, safe passage, and the identification of hazards or obstructions.  Since light output decreases over time as lamps age and as dirt accumulates on luminaires, windows, ceilings, walls and other room surfaces, higher initial levels could be used to compensate for their depreciation and maintenance should be performed to reduce these effects.

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Rules for Environmental Controls (OAR 437-002-0144). Oregon Occupational Safety and Health Division. 1994. http://www.cbs.state.or.us/external/osha/pdf/rules/division_2/437-002-0144.pdf

The Illuminating Engineering Society of North America (IESNA), a technical organization that develops recommendations for lighting, addresses the lighting requirements of warehouses and storage areas in its Design Guide for Warehouse Lighting (DG 2-92).  A new system called the IESNA Lighting Design Guide was introduced in the IESNA Lighting Handbook, 9th Edition, published in 2000.  The Design Guide for Warehouses is under revision to track the methods presented in the Handbook.

These days we are lucky enough to apply the same photographic and cinematographic principles to our work as visual effects artists lighting shots. That's why we are always talking about cinematography and cinematic language. Today we are going to talk about some very common techniques in the cinematography world: hard light, soft light, specular light and diffuse light.

Diffused lighting living room

Diffused lighting examples

Illuminance is the amount of light falling on a surface. The units of measurement are lux and footcandles.  A light meter is used to measure it.

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Besides its quantity, lighting should also be evaluated in terms of its quality, i.e., freedom from glare, shadows, extreme contrasts, correct direction, distribution, and visual fatigue.

If the lighting source is way bigger than the subject and it's place near of it, the light beam will be curved a lot, even they will get mixed at some point. Consequently the profile of the subject will not be represented in the shadows.

In the construction industry, OSHA’s standard on Illumination (29 CFR 1926.56) specifies 5 footcandles as the minimum illumination intensity for construction material warehouses while any work is in progress.

Diffuse LightCeiling

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When a light beam impacts on the surface of an object, if the size of the lighting source is similar to the size of the object, the light beam will go parallel and get slightly curved towards the interior.

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SCHOTT Tubular Diffuser for Ring Lights is useful for viewing opaque samples under the microscope.

Luminaire is a complete lighting unit, often referred to as a “light fixture.”  A luminaire consists of the lamp, optical reflector and housing, and electrical components for safely stating and operating the lamp.

Flicker refers to quick, repeated changes in light intensity – light that appears to flutter and be unsteady. Although humans cannot see fluorescent lights flicker, the sensory system in some individuals can detect the flicker.

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