Using luminaires: direct lights, downlights, accent lights and indirect lights: this article describes the different types of luminaire light fixtures and how they are used, including direct lighting, indirect lighting, downlights, accent lights, recessed lights, pot lights, ceiling lights, and wall sconces or similar lighting fixtures.

We define luminaires, include a catalog of types of direct and indirect lighting, and we explain the use of downlights & accent lights.

Here we provide a guide to the types of bulbs used with recessed & track lights and the types of housings used with recessed or "pot" or "can" lights.

We discuss the best uses of recessed lights & track lighting, and we provide advice about best kitchen & bathroom lighting designs.

Definition & Use of Luminaires

A -common and long-established example of a luminaire would be a fluorescent lighting fixture mounted directly to a ceiling or wall: its connection to power is made inside of the lighting fixture, and an external electrical box is not required.

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While there are thousands of different luminaires on the market, they all fall into a few basic categories.

Many mix more than one lighting strategy within a single fixture.

Definition of Luminaire Lighting: A luminaire light is one that is a complete electric light in one physical container or device.

In the U.S. the National Electrical Code (NEC) Article 100 gives this definition of "luminaire":

Luminaire: A complete lighting unit consisting of a light source such as a lamp(s) with parts designed to position the light source and connect it to the power supply.

Below: during electrical repair work, InspectApedia.com's editor (DF) shows how the steel box forming the base of a bathroom fluorescent light fixture also serves as the container for electrical wiring connections in a Minnesota home constructed in 1963.

The electrical wire bringing power to this light fixture enters the fixture directly; no separate electrical box was required.

4 Categories of Luminaires

The links below provide descriptions of the four categories or lighting strategies using luminaire light fixtures:

• DIRECT LIGHTS
• DOWNLIGHTS
• ACCENT LIGHTS
• INDIRECT LIGHTS

Many luminaires combine two or more of these strategies.

For example,many dining room chandeliers include a downlight that provides accent or task lighting to the table top in addition to the fixture’s ambient lighting.

Common fixture types and placement are covered in the article below.

This article also discusses

• BULBS for RECESSED & TRACK LIGHTS
• RECESSED LIGHT HOUSINGS
• RECESSED LIGHT TRIMS
• RECESSED LIGHT FIXTURE SPACING
• CLOSET LIGHTING
• KITCHEN LIGHTING
• AMBIENT LIGHTING
• TASK LIGHTING
• TABLE TOP LIGHTING
• BATHROOM LIGHTING
• LUMINAIRE STANDARDS & CODES

Below, and at the top of this page: lighting fixtures at Frank Lloyd Wright's Taliesin West, Scottsdale Arizona, first opened in 1937. Many of Taliesin West's light fixtures are luminaires.

Catalog of Types of Direct Lights

These include most surface-mounted fixtures on walls and ceilings, often with a diffusing globe or lens to reduce glare.

In general, these are very efficient sources of light, but may also produce a lot of glare.

Common types include surface-mounted ceiling fixtures, pendants, chandeliers, and sconces.

• Surface-mounted ceiling lights. Either incandescent or fluorescent fixtures mounted directly on the ceiling are a very efficient source for ambient lighting. Some, such as fluorescent “clouds,” use rounded diffusers that cast light on the ceiling as well as downward.
• Pendant ceiling lights. Pendant fixtures are often used to provide task lighting above kitchen tables or eating counters and may also project light sideways and upward to the ceiling.
  
  Select a fixture at least 12 inches less in diameter than the table’s smallest dimension and mount the fixture 27 to 36 inches above the table or counter (see Figure 5-24 above).
  
  Mini-pendants with halogen spots are often used to accent breakfast bars and kitchen islands.

• Chandeliers. When used over dining room tables, select a fixture at least 12 inches less than the width of the table and locate them 27 to 36 inches above the table, as in Figure 5-24 above).
  
  Some fixtures contain a central downlight to provide task lighting to the table.
• Sconces. Wall sconces provide soft lighting in living and dining areas and hallways.
  
  Most provide some direct lighting as well as an indirect “wash” of light upward onto walls and ceilings.
  
  Often placed in pairs, they are typically located about 66 inches from the floor to the center of the sconce (Figure 5-25 shown below). Our photo of wall sconces is from the dinner theatre at Taliesin West - D Friedman.

What are Downlights & How are they Used?

These are predominantly recessed ceiling lights that create a dramatic effect by casting pools of bright light on floors and work surfaces while leaving the ceiling in shadow.

Used with A lamps, floods, or compact fluorescent, and spaced properly, downlights can create even general lighting.

With more focused spot bulbs and special trims, they can function as task lighting, accent lighting, or wall washers.

 

 

 

 

What are Accent Lights?

When lighting a picture or single object, use a directional spot lamp in a shielded fixture.

These are often track-mounted or adjustable recessed fixtures, such as “eyeballs.”

Our photo (left - DJF) shows how Frank Lloyd Wright used accent lights in the corners of "the bunker" at Taliesin West as part of a compendium of different lighting methods all demonstrated in this space: direct, indirect, accent, and track lighting all are installed and create different effects in this structure that has no exterior windows (and was originally used for storage).

To create even lighting over a large picture or group of pictures, it is best to use special “wallwasher” fixtures, or non directional lamps such as A-bulbs or compact fluorescent's (Figure 5-23 below)

What are Indirect Lights & how is Indirect Lighting Best Used?

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Bouncing light off light-colored walls and ceilings creates a soft and diffused illumination with little glare and gives a room a feeling of spaciousness.

Examples include upward directed floor lamps and wall sconces, as well as site-built coves and valences, which can make use of cost-effective fluorescent tubes.

Coves reflect light off the upper walls and ceiling and dramatize a high or cathedral ceiling. Brackets provide down lighting as well to emphasize wall surfaces or artwork.

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Typical cove and bracket details are shown in Figure 5-26 (above) and Figure 5-27 (below).

The shield should be designed to protect the bulbs from view within the room.

Best Uses of Recessed and Track Lighting

Recessed lighting can provide either ambient, task, or accent lighting, depending on the lamp type, its beam spread, and the type of reflector and trim used. Where recessed fixtures are used for ambient lighting, they should be spaced to provide even lighting without dark spots.

Track lighting follows the same design principles as recessed, but is best used for accent or task lighting in certain situations. It is particularly well-suited to situations where flexibility is required since fixtures may be easily moved as lighting needs change.

Guide to Lamps (Bulbs) Used with Recessed & Track Lights

Beam spreads for directional lights vary depending on the lamp and fixture. For general lighting, choose a wide flood with a beam spread of at least 50 degrees. BR lamps are the most economical directional lamp and provide good enough beam control for general lighting. Standard A lamps with Alzak trim or compact fluorescent also provide good general lighting.

Halogen PAR lamps offer more precise beam control suitable for task or accent lighting. Low-voltage M-16 and PAR36 lamps offer very precise beam control, making them well-suited to accent lighting. Because of their narrow focus, spots produce higher illumination levels than floods but over a smaller area. Beam spreads and lighting levels for common directional lamps are shown in Table 5-24.

Guide to Recessed Light Housings

Typical residential recessed lights come in 4- to 7-inch diameters and can take a variety of different trims that significantly affect light output and glare.

For general lighting, a 5- to 7-inch diameter housing is commonly used. For accent lights, smaller 4-inch housings are available for both line-voltage and low-voltage figures. Special recessed housings are also available for compact fluorescents, sloped ceilings, and retrofit installations.

Standard recessed housings must be left uninsulated above. For insulated ceilings, use a can rated IC for “insulation contact.” Also make sure the housing is rated “airtight,” which is not true of all IC units. Air leaks through recessed lights can be a significant source of heat loss and moisture problems in cathedral ceilings.

Recessed Lighting Fixture Trims

The common black or white step baffles are designed for use with a PAR or BR lamp, although homeowners often put in the less expensive A19 bulbs.

Baffles reduce glare, but also cut light output by 50% or more for A lamps and up to 40% for directional lamps. Black baffles cut light output significantly more than white (Figure 5-28).

For maximum light output from a recessed lighting fixture, use a clear or gold specular reflector, also known as Alzak trim.

To reduce glare, which can be a problem with these highly efficient reflectors, it is best to use a deep-profile Alzak trim, offered by most recessed lighting manufacturers.

These work well with standard A19 bulbs as well as BR lamps (Figure 5-29). Gold Alzak is about 10% less efficient than the clear style.

For accent lighting, eyeballs and similar adjustable trims allow the homeowner to direct the light to the artwork or architectural feature being lit (Figure 5-30).

These are typically used with a narrow spot to provide bright focused light on a small area. Slotted wall wash trim is used to splash diffused light on broad areas of wall or bookcases. Non directional A lamps or compact fluorescents work well in this application. General recommendations for recessed lighting bulb wattage or bulb type and fixture spacing are given in Table 5-25.

Spacing Guidelines for Light Fixtures

The general rule for ambient or task lighting is to space recessed ceiling fixtures approximately the same distance apart as the beam spread at the work height, typically assumed to be 30 inches above the floor (36 inches for kitchen counters). The beam spread is the central cone of light, where the beam is at least 50% of the brightness at the center of the beam.

Most manufacturers publish beam spread data for their recessed lights with different trim options. Beam spreads and lighting levels for some common fixtures and lamps are shown in Table 5-26.

Table 5-26.

For ambient lighting, choose a compact fluorescent, A lamp, or wide flood with a beam angle of at least 50 degrees. Typical spacing for ambient lighting with recessed lights is 6 to 7 1/2 feet for an 8-foot ceiling, or 7 to 8 1/2 feet for a 9-foot ceiling. Spacing from the first row of lights to the wall is half this distance.

For accent lighting, space recessed or track fixtures so their light hits the wall at about 30 degrees. For lighting a large wall area, the distance between fixtures should be equal to or less than their distance from the wall (see Figure 5-23).

Figure 5-23

Closet Lighting Selection & Installation - Fire Safety Clearances

Due to risk of fire, the International Building Code and the National Electrical Code require that all fixtures installed in closets must be either surface-mounted or recessed and must completely enclose the bulb. Only incandescent or fluorescent lamps are allowed.

In addition, the fixture must be installed either in the wall above the door or on the ceiling and have the following clearances:

• For surface-mounted incandescent fixtures: 12 inches to the nearest point of clothing or storage space.
• For surface-mounted fluorescent fixtures: 6 inches to the nearest point of clothing or storage space.
• For recessed fluorescent or incandescent fixtures (with a completely enclosed lamp): 6 inches to the nearest point of clothing or storage space.

Kitchen Lighting Requirements

Kitchens require general ambient lighting as well as task lighting on sinks, ranges, counters, and eating areas. Given the high lighting needs of a kitchen, the energy savings from fluorescent lights can be substantial.

Look for fluorescent bulbs with a CRI over 80 and a color temperature near 2800K to match standard incandescent lights, or 3500K to match halogen lights.

Ambient Kitchen Lighting Specifications

For efficient general lighting, use one or more enclosed ceiling fixtures with a white diffuser that illuminates the ceiling as well as the space below. In a very small kitchen, placing the ceiling fixture near the sink and counter can provide effective task lighting as well.

For a softer glow in a kitchen, indirect lighting can also work nicely with lights placed in coves and above the cabinets to illuminate the ceiling.

Although not the most energy-efficient, recessed lighting has become a popular choice for kitchen lighting because of its sleek appearance and dramatic effect. For even lighting, use fixtures and lamps with wide beam spreads and spacing based on a 36-inch work plane (Figure 5-23 below).

Figure 5-23 is given above. Also see the discussion on “Spacing,” page 202 in the printed text of this book.

As a rough guide, the American Lighting Association suggests the following minimum lighting levels:

• Small kitchens of under 75 square feet: 150 watts of direct incandescent lighting from up to three bulbs, or about 60 watts of fluorescent.
• Kitchens up to 125 square feet: 200 watts of incandescent from up to four bulbs, or about 80 watts of fluorescent.
• Kitchens over 120 square feet: two watts of incandescent lighting or
  34
  watt of fluorescent per square foot of floor area.

These numbers should be increased by 50 to 100% for indirect lighting, dark surfaces, lighting placed high in cathedral ceilings, or use of recessed lights with diffusers, baffles, or other light blocking trim.

Kitchen Task Lighting Guidelines for Counters, Sinks, Cooktops

Work counters, sinks, and cooktops all need high lighting levels. Where wall cabinets are present, under cabinet lighting provides excellent illumination for counters. Place lights as close as possible to the front of the cabinets to avoid glare reflecting off the work surface (Figure 5-23 shown above).

Low-voltage xenon “festoon” lamps provide bright, even light similar to halogen but without the high temperatures and pressures, eliminating the safety concerns associated with halogen. Also, xenon lamps can be touched with bare skin and provide 10,000 hours of service.

An alternative for lighting at counters is to place a row of recessed fixtures directly over the outer edge of the counter. If used for task lighting, place fixtures about 36 inches apart for 8-foot ceilings or 48 inches apart for 10-foot ceilings (see Task Lighting in Table 5-25).

Sinks, cooktops, islands, and counters without cabinets above can be lit by small recessed downlights or track lighting. Mini-pendants with 12-volt halogen bulbs offer an attractive and functional way to illuminate islands, peninsulas, and eating counters (Figure 5-23).

Table Top Lighting Specifications

Choose a pendant at least 12 inches less in diameter than the table’s smallest dimension and mount the fixture 27 to 36 inches above the table.

A 120-watt incandescent or 40- to 50-watt fluorescent fixture will generally provide sufficient illumination (see Figure 5-24).

Bathroom Lighting Guidelines

Bathroom Mirror Lighting Recommendations

Good lighting is critical at the bathroom mirror for shaving, makeup, and other tasks of personal hygiene. For optimal lighting, place strip lights or globe type light bars at least 16 inches long on each side of the mirror centered at 61 to 64 inches (about the average eye height). Wall sconces on either side are also an option for smaller mirrors. These provide even cross lighting without shadows or glare (see Figure 5-23).

Figure 5-23

For small mirrors under 30 inches wide, use about 75 watts of incandescent lighting or 20 watts of warm-white fluorescent on each side. For larger mirrors, use up to 150 watts of incandescent or 40 watts of fluorescent on each side. Additional lights across the top of larger mirrors are also helpful. If using fluorescents, select lamps with high CRIs and warm color temperatures in the 2700K to 3000K range.

Lighting from above the mirror only using globe-type light bars, a pair of recessed downlights, or a lighting soffit is acceptable as long as the vanity top is a light color. Otherwise, areas under the eyes, nose, and chin will be in shadow. If recessed fixtures are used, choose an A lamp, flood, or compact fluorescent for a diffused beam.

General Lighting for Bathrooms

As a rule of thumb, provide one watt of incandescent or 1/3 to 1/2 watt of fluorescent light per square foot of floor space. Increase this by 50 to 100% for recessed lights, indirect lighting, or a room with dark surfaces. In a small bathroom, the mirror lights can also provide the ambient light.

For larger baths, a separate ceiling fixture mounted near the tub and toilet can be useful for ambient light and reading. Finally, in a room with a high ceiling, indirect lighting with coves or uplights can create a feeling of spaciousness in a bathroom, along with a pleasing, soft glow.

Guidelines for Lighting Over Tub and Shower

A recessed light with a white diffuser mounted over the tub or shower will be appreciated by bathers. Electrical codes require that these fixtures be totally enclosed and rated for use in a damp location (tub area) or wet location (shower). Most require GFCI protection for their UL rating. In addition, fixtures must be at least 6 feet above the water line and switches must be a minimum of 5 feet from the edge of the bathtub or shower.

Watch out: Check with local code officials in your own jurisdiction for specific lighting and electrical safety requirements.

- - Adapted with permission from Best Practices Guide to Residential Construction (Steve Bliss, J Wiley & Sons) .

Luminaires: Standards, Codes, Marking

Why is this Light Fixture NOT a Luminaire?

Shown here: a lighting fixture mounted on a ceiling of a New York study. Because this light fixture does not include an integral housing that would serve to contain its connection to power, it does not qualify as a Luminaire, and an electrical box was required.

• Luo, Anna, EVALUATION OF ELECTRIC LIGHTING PRODUCTS [PDF] (2017) US CPSC, Division of Electrical Engineering, Directorate for Engineering Servies, U.S. Consumer Product Safety Commission, retrieved 2018/09/11, original source: https://www.cpsc.gov/s3fs-public/lighting.pdf
  
  The article includes citations of electrical light fixture failures that include or involve plastic parts.
• LUMINAIRES, MARKETING & APPLICATION GUIDE [PDF] (2016) Underwriters Laboratories, retrieved 2018/09/11, original source: https://www.ul.com/wp-content/uploads/2014/09/Luminaires_MG.pdf
  Excerpt:
  UL has developed this guide for use by code authorities, electric utilities, contractors, installers, users, system designers, and other interested parties to aid in understanding the basic components of luminaires and the applicable codes and standards in order to facilitate a reasonably safe and code-compliant installation.
  
  This Luminaire Marking Guide contains information to make it easier to locate specific markings. The guide consists of 77 notes indexed by both luminaire type and subject matter.
  
  Each note describes a marking and briefly explains the meaning and terminology of the marking. This edition has been updated in accordance with the 2014 National Electrical Code (NEC) ® and UL Luminaire Standards revisions through October 17, 2012.
• UL Standard 1598 Luminaires, retrieved 2018/09/11, original source: https://standardscatalog.ul.com/standards/en/standard_1598_4
  
  1.1 This Standard applies to luminaires for use in non-hazardous locations and that are intended for installation on branch circuits of 600 V nominal or less between conductors in accordance with theCanadian Electrical Code, Part I (CEC), CSA C22.1, with the U.S. National Electrical Code (NEC), ANSI/NFPA 70, and with the Mexican National Electrical Code, NOM-001-SEDE.
  ...
  1.3 Requirements applicable to light emitting diode (LED) components and subassemblies integral to a luminaire covered by this standard are provided in UL 8750 and CSA C22.2 No. 250.13.
• UL Standard 8750, Standard for Light Emitting Diode (LED) Equipment for Use in Lighting Products, retrieved 2018/09/11, original source: https://standardscatalog.ul.com/standards/en/standard_8750_2
  
  1.1 These requirements cover LED equipment that is an integral part of a luminaire or other lighting equipment and which operates in the visible light spectrum between 400 – 700 nm. These requirements also cover the component parts of light emitting diode (LED) equipment, including LED drivers, controllers, arrays, modules, and packages as defined within this standard.

Lighting & Light Bulb or Fixture & Luminaire Industry & Trade Associations

• American Lighting Association www.americanlightingassoc.com

- - Adapted with permission from Best Practices Guide to Residential Construction (Steve Bliss, J Wiley & Sons) .

...

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