Visual Newsletter
Placing Luminaires with the Array Command

The Array command saves time, helps create equal spacing between luminaires, and helps determine the quantity of luminaires to use in a space. There are two types of Arrays – Rectangular and Polar. Rectangular arrays are used to place luminaires in a rectangular pattern using either the quantity of luminaires or the spacing between luminaires. Polar arrays are used to place luminaires in a circular pattern using either the size of the angle the luminaires fit into or the size of the angle between luminaires.

The rectangular array may be used to generate a grid of luminaires or a single row or column of luminaires. To create a rectangular array, follow the directions below.

Creating a Rectangular Array
  1. From the Construct menu, select Array, then Rectangular
  2. Left-click to select the luminaire to array
  3. Right-click to finish the selection
  4. In the Properties Bar, select Array by Spacing or Array by Quantity
  5. Type in the Quantity or Spacing
    Note- When arraying by quantity, the original luminaire is counted as part of the quantity.
  6. If you have a mouse pointer instead of the mouse crosshair, left-click to return focus to the Design Environment
  7. Left-click to set a Base Point
    This is a reference point that you use to create the array. It is often a good practice to set the Base Point at the center of the luminaire that is being arrayed.
  8. Move the mouse across the screen to define the area for the array
  9. Left-click to complete the Array command

Polar arrays are used to place luminaires in a circular pattern. With polar arrays, Angular Extent is used to define the size of the angle the luminaires will fit into. Angular Separation is used to define the size of the angle between luminaires. To create a polar array, follow the directions below.

Creating a Polar Array
  1. From the Construct menu, select Array, then Polar
  2. Left-click to select the luminaire to array
  3. Right-click to finish the selection
  4. In the Properties Bar, select Angular Separation or Angular Extent
  5. Type in the Quantity and Angle
  6. If you have a mouse pointer instead of the mouse crosshair, left-click to return to the Design Environment.
  7. Left-click to set a Base Point
    Generally the base point will be set in the center of the object to be illuminated.

For a short demonstration of using arrays, view the instructional video “Luminaire: Using Arrays” on the Training - Instructional Videos Web page.

Training - Instructional Videos
How to Determine Luminaire Spacing

Use Lumen Method

For interior designs, appropriate spacing can be determined by modeling spaces inside the Lumen Method tool, which is available through the Tools menu of Visual Professional Edition. For example, to determine luminaire spacing in an aisle with racks, model the aisle and racks as a room. The modeled aisle can then be imported into Visual Professional Edition and further modified, or the column and row spacing can be used as guidelines for placing the luminaires in Visual Professional Edition.

Use Templates

Templates are calculated iso-illuminance contours for an individual luminaire. For example, a one-footcandle iso-illuminance contour indicates where one footcandle appears under a luminaire. A luminaire may have multiple iso-illuminance contours for a template, which can be controlled and edited in the Luminaire Schedule.

Templates can be used to determine luminaire spacing by using them to meet a minimum illuminance level. Set at least one iso-illuminace contour of the template to half the desired minimum illuminance level. While placing luminaires, overlap this iso-illuminace contour with the same iso-illuminance contour of an adjacent luminaire. The contribution from each luminaire will raise illuminance levels in the overlapping area to the desired minimum illuminance and the luminaires will be properly spaced. To turn on templates, follow the directions below.

Turn on Templates
  1. From the Luminaire menu, select Schedule
  2. Left-click to select the luminaire
  3. Left-click the Template icon to open the Template window
  4. Left-click the rectangle beneath the iso-illuminace contour value to turn on a iso-illuminace contour for that value
  5. If necessary, type new iso-illuminace contour values
  6. If necessary, left-click the drop-down arrow on the rectangle to change the iso-illuminace contour color
  7. Repeat steps 4-6 to format all additional iso-illuminace contours
  8. Left-click OK

Use Spacing to Mounting Height Ratio

Spacing criteria can be multiplied by the mounting height to get an estimate of the center-to-center luminaire spacing that will maintain uniform illuminance on the work plane. The spacing criteria for a luminaire is listed in its specification sheet. Specification sheets are generally available on the manufacturer’s Web site and may list multiple spacing criteria for multiple mounting positions. Spacing criteria may also appear in the Catalogue Number field of Visual Professional Edition’s Luminaire Schedule.


Introducing ISD SuperGlass(tm) Reflectors
With ISD SuperGlass(tm) Reflectors, the entire range of Spacing to Mounting Height Ratios (SMHR) are covered with only two reflectors. Therefore, the luminaires can be moved within each range and they will still be optimized for performance and uniformity. The rest of the industry requires the customer to adjust the light center of their reflectors in order to accommodate the different spacing criteria. This break-through in optical performance is only available through Holophane and is protected with patents and trade secrets. To learn more about ISD SuperGlass Reflectors, visit the Holophane Web site at http://www.Holophane.com.