Virtual Sun Model A7 Design Guide

Virtual Sun Model A7 Design Guide

Understanding Infinity Focus / Parallax-Free Sun

In a building with multiple skylights, observers can only see the Sun through one skylight at a time.  Because the Sun appears to be millions of miles away, the angle between one’s eye and the Sun never changes as you walk around the room and the Sun appears to follow you in the sky. Virtual Sun acts the same way. When you install multiple Virtual Sun units (Model A7) into a ceiling side by side, it creates the impression of one large skylight.

Units can be installed in a tight 1 dimensional or 2 dimension grid to create the impression of an even larger skylight with more dramatic effect.    

For more even illumination across a large space, it may be necessary to space units in the ceiling further apart.  

In all cases, The Sun will appear to follow an observer in the sky as they walk under the units.  As the viewer moves their view point from one fixture to the next, only one Sun will be visible.

Orientation & Ceiling Heights

Innerscene Virtual Sun Model A7’s unique patented parallax-free Sun appears at a 30 degrees angle from vertical.

Virtual Sun Model A7 projects a beam of light and casts a bright spot onto the floor below just as our real Sun. We recommend a minimum viewing distance of at least 1-feet(0.3m) away from the fixture to get the best viewing experience of the Sun. Therefore, the spaces where Virtual Sun Model A7 is to be situated should be a minimum of 7-feet(2.1m) in height.

Due to the directional nature of the Sun’s beam of light, we recommend fixtures within the same space to be installed in parallel and in the same orientation to maintain a consistent Sun position in the sky. All Virtual Sun fixture enclosures have markings to indicate the direction of the Sun.

If units are installed as shown left, an observer standing between the two units would see 2 suns in the sky.   When all units are installed having the same orientation, each person in the room will only see one Sun no matter how many units are installed.

Room CCT Balancing

Innerscene Virtual Sun Model A7 is able to emit a wide range of both the sky and sun scenes from the warm glow of sunrise/sunsets to blue summer sky with the warm glowing Sun above.

Virtual Sun Model A7 can output light with CCTs (Correlated Color Temperature) in the range of 3000K at its warmest colour temperature to over 10,000K at it’s coolest.  

When a blue sky look is desired, the coolest CCT is used. Average CCT targets for office environments range from 4000K to 6500K and home environments often use 2700K.  In environments where no outside lighting is present to balance the CCT, additional warm CCT lighting is recommended to achieve both a blue sky look and a lower CCT average.

Adding complementary warm light sources such as down lights or free standing lights can be used to achieve a lower average CCT for a room when a blue sky setting is enabled.

When designing a space, adding additional standard ceiling downlights or floor lamps with a low CCT (2700K or lower) can help balance the average room CCT.

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Virtual Sun Model A7 Lighting Levels

The ideal light levels in a space depends on the task required. For example, the Chartered Institution of Building Services Engineers (CIBSE) Code for Lighting recommend the following light levels on the work plane:


Offices

Retail  
Engineering
Banks
Kitchens
Lobbies
Churches & halls

Foot Candles
28 to 46 FC
45 to 93 FC
28 to 93 FC

45 FC

28 to 46 FC

19 FC

28 FC

Lux
300 to 500 lux

500 to 1,000 lux
300 to 1,000 lux

500 lux

300 to 500 lux

200 lux

300 lux

The Illuminating Engineering Society (IES) recommends the following footcandle levels to ensure adequate illumination and safety for occupants:


Commercial Office
Classroom
Gymnasium  
Auditorium  
Corridor

Retail  

Auto Showroom
Hotel/Hospital Lobby

Foot Candles
15-40 FC

40 FC

30 to 125 FC
7.5 FC

25 FC

20 to 80 FC

50 FC

5 FC

Lux
160-430 lux

430 lux

320 to 1,340 lux

80 lux

270 lux

215 to 860 lux

540 lux

54 lux

Virtual Sun Model A7 Lighting Layout

PLAN VIEW

To aid quick lighting layouts, Innerscene has produced illuminance intensity simulations using typical 9-foot (2.8m) ceiling heights as well as several typical fixture spacings below. For other layouts please get in touch with our technical team and we would be happy to assist. Alternatively, an experienced lighting designer will also be able to use our standard photometry files to simulate the lighting layouts for your particular requirements. Actual spacing will depend on your requirement and structural considerations.  The absolute minimum X spacing, where the trims are adjoining, is approximately 21-11/16” (551mm). The absolute minimum Y spacing is 41”(1042mm).  To achieve more uniform lighting distribution in larger spaces, Innerscene recommends utilising multiple fixtures in regular rows or columns.

To give the appearance of a single continuous larger sky light, Innerscene recommends arranging multiple fixtures as close together as possible in a line or grid.  The Sun appears to be millions of miles away in all fixtures. As the viewer moves their view point from one fixture to the next, only one Sun is visible at any time, thus completing the illusion of a single expansive sky light. To maximise this effect, the fixtures should be situated as close together as possible.

Virtual Sun Model A7  Individual Fixture Lighting Levels

Using lighting calculation softwares such as Dialux, Innerscene has simulated the approximate illuminance level on the working plane in various room scenarios. The simulation was done with the following assumptions:

Room dimensions:  Length 31-1/2ft (9.6m) Width 31-1/2ft (9.6m) Height  9ft (2.743m)  

Reflectances(*)

Ceiling 70%

Walls 50%

Floor 20%

Maintenance factor (MF) (**)

0.8 (typical maintenance intervals)

* Reflectances - These values determine how reflective your walls, floors, and ceiling surfaces are.  Exact values may vary in practice.

Different room dimensions, reflectances and maintenance levels will have some effects on the actual illuminance. In the charts below, the red rectangles [] represent the fixture position in the ceiling. The numbers represent approximate illuminance in foot-candles or lux at the work plane 2-1/2 ft (0.75m). The greyscale shading represents the gradient of illuminance on the work plane, white is the brightest and dark grey is the dimmest. The white areas are offset from the fixture location due to the 30 degrees tilt of the Sun beam.

Imperial System (USA)

9-foot ceiling height

illuminance in foot-candle(FC)

Metric System (Rest of world)

2.8m ceiling height

 illuminance in lux

Virtual Sun Model A7 Line Arrangement Lighting Levels

Imperial System (USA)

9-foot ceiling height

illuminance in foot-candle(FC)

Metric System (Rest of world)

2.8m ceiling height

Illuminance in lux

Fixture location on the ceiling

Simulated illuminance level in Foot Candles (FC)  or Lux

Gradient of simulated illuminance level in FC or Lux

Tightly Packed Grid Arrangement Lighting Levels

PLAN VIEW

Imperial System (USA)

9-foot ceiling height
X=21-11/16”, Y=41”

illuminance in foot-candle(FC)

Metric System (Rest of world)

2.8m ceiling height

X=1042mm, Y=551mm

Illuminance in lux

The above scenario shows the tightest possible grid arrangement at 41” (1042mm) and 21-11/16” (551mm), Y and X on-center spacings, respectively.

Fixture location on the ceiling

Simulated illuminance level in FC or Lux

Gradient of simulated illuminance level in FC or Lux

Spaced Grid Arrangement Lighting Levels

PLAN VIEW

Imperial System (USA)

9-foot ceiling height
X=6’, Y=6’

Illuminance in foot-candle(FC)

Metric System (Rest of world)

2.8m ceiling height

X=1.8m, Y=1.8m

Illuminance in lux

Fixture location on the ceiling

Simulated illuminance level in FC or Lux

Gradient of simulated illuminance level in FC or Lux