The example below walks you through the design of a cove.
For additional assistance, contact Crescent Lighting.

Figure 1: Room Section

Figure 2: Cove Detail - F30

Notes
1. For tungsten halogen and HID units, the cove shall be constructed from non-combustible materials.
2. Refer to appropriate luminaire photometric report to determine location of maximum candlepower with respect to reflector.
3. Remote ballast(s) can be mounted within the cove. If space is limited, ballast(s) can be mounted in a remote accessible location.

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Luminaire Position

Setback
Setback (X) is the perpendicular distance form the lamp centre to the target surface, as shown below. Proper setback is necessary to avoid excessive bright spots on the target surface, and to take full advantage of the luminaire’s asymmetric distribution.

Proper setback depends on the throw distance (D, see following section) and on whether the lamp source is a point source or a linear source. The chart below shows guidelines for determining proper setback based on these two factors:

Orientation
Elliptipar luminaires light ceiling or wall planes from one edge, when oriented as shown below.

Proper placement of luminaires is necessary to maximise uniformity on the lighted surface, as well as reduce the potential of glare.

The following are general guidelines for luminaire placement in terms if aiming, setback, spacing and brightness control.

Aiming
Proper aiming is dependent on two factors: the luminaire’s maximum candlepower and the length or height of the surface to be lighted (the throw distance, see dimension D at right). The luminaire should be aimed such that the line of maximum candle-power strikes the lighted surface at approximately 3/4 to 7/8 across or down the lighted surface. The angle of maximum candlepower may be found on the luminaire’s photometric report.

Most Elliptipar luminaires have adjustable reflectors, allowing them to be “fine-tuned” during installation.

Spacing
On-centre spacing (Y, see diagrams below) effects the lateral uniformity on the target surface. It is dependent on the setback (x), and generally applies to point source luminaires only. It is recommended that on-centre spacing of point sources be between 1-3/4 and 2 times the setback value.

Elliptipar recommends that linear source luminaires be mounted end-to-end to form continuous rows. Socket shadows on the target surface will be minimised provided recommended setbacks are maintained (see above).

Brightness Control
Bright lenses or reflectors within an observer’s normal field of view may result in glare. Therefore, controlling luminaire brightness is very important to the success of an application. For uplighting, the worst case viewing position is often the farthest and/or most elevated position in the space. For wall washing, the worst case viewing position is often near doorways or where people circulate around wall corners. If luminaires cannot be located so as to conceal lens brightness from view, elliptipar offers a variety of options and accessories which may provide adequate shielding.

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Spacing - Uplighting a Horizontal Surface

Dimension Key
D = Throw distance
X = Setback (target surface to lamp centre)
Y = On-centre spacing

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Spacing - Washing Down a Vertical Surface

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Applications

Lighting the Vertical Plane
From above and below
wall
perimeter
art/display
merchandise
chalk/write board
signage






From above and below
wall
facade
floodlighting
signage

Lighting the Horizontal Plane
From above and below
ceiling
cove
canopy
vaultcoffer
soffit

From above and below
floor
ground
pole/post mounted
desk (task lighting)
landscaping

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Styles

100 series - Surface

Exposed reflector

200 series - Semi-Recessed

Fixed reflector

Adjustable reflector

300 series - Concealed

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Sources

T - Tungsten Halogen

R75 double end

F - Linear Fluorescent

T5

T8

F - Compact Fluorescent

Quad tube

M - Metal Halide (clear only)

Ceramic arc tube (G12)

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