Meeting Room Lighting Redesign Meeting Room #4287 Introduction The Meeting Room (room #4287) is located on the fourth floor within the grand spiral staircase in the atrium. The room is shaped like half a circle combined with half of an ellipse, somewhat of an irregular shape. The space features 12 seats and a large conference table, used for meeting and presentations. The focus of the room is the clear-casted glass panels that form half the perimeter walls of the room, along with the circular drop ceiling in the room. N Figure 6.1 ~ 4 th Floor Plan; Meeting Room location with respect to the rest of the building 46
Design Goal To highlight architectural details of the room: cove ceiling and the irregular shape of room To provide even ambient lighting for the room Design Criteria Vertical surface illuminance must be adequate for presentations and use of whiteboard Flexibility of lighting control system for the different uses of the room High color rendering properties of lamp to render people s faces properly Figure 6.2 ~ Meeting Room #4287 room layout Target Illuminance o Horizontal: 30 fc o Vertical: 5 fc Power Allowance: 1.5W/ft 2 47
Design Concept Create an elliptical drop ceiling in the middle of the room directly above elliptical conference table to emphasize shape of the room. Concealed linear fluorescent cove fixtures used in the cove around the perimeter of the room. One single pendant in the middle of the room providing focus to the central point of the room. (Table 6.1 lists the luminaires for the lighting design of the Meeting Room) CM1 CJ1 FB1 Figure 6.3 ~ Luminaire layout for the lighting system of Meeting Room 48
Table 6.1 ~ Lighting Fixture Schedule for luminaires used in the Meeting Room Fixture Luminaire Type Mounting Photometric Web # lamps & Wattage Lamp type LLF CJ1 LITE- CONTROL P-ID-3300 Pendant Indirect/Direct Pendant 3 x 40 BIAX 0.58 CM1 Belfer 2801 FX2 Field Curvable System Cove 1 x 13 GX23 0.65 FB1 LITE- CONTROL Cove-25 Concealed Cove System Cove 1 x 54 T5HO 0.60 49
Light Loss Factors The light loss factors used in the calculation of the lighting system in the Meeting Room are listed as follow: Meeting Room Fixture BF Dirt Cond. Maintenan ce Category Cln. Interv LDD RSDD LLD Total LLF CJ1 0.98 Very Clean VI 12 0.93 0.67 0.95 0.58 CM1 0.9 Very Clean VI 12 0.93 0.9 0.85 0.65 FB1 1.02 Very Clean VI 12 0.93 0.67 0.95 0.60 Table 6.2 ~ Light Loss Factor for fixtures used in the Meeting Room Lighting Power Densities The power density for the lighting system in the Meeting Room are calculated as follows: Fixture Lamp Watt # Lamps Input Watt # used Total Wattage CJ1 40 3 124 1 124 CM1 13 1 16 18 288 FB1 54 1 60.8 24 1459.2 Total Wattage (W) Total Area (sf) Power Density (W/sf) 1871.2 800 2.34 Table 6.3 ~ Power density calculations for the two different lighting designs The power allowance for a space like the meeting room is 1.5W/ft 2 (from IESNA/ASHRAE Standard 90.1, 1999). The power density for this lighting design is 2.34 W/ft 2, which exceeds the allowable power density of the space. However, an extra allowance of 1W/ft 2 is added to the suggested value to make it 2.5W/ft 2, since a large amount of lights in this space (especially in cove) are for accenting purposes for both inside the meeting room and appearance looking from outside the staircase. After this adjustment, the power density of the lighting in the meeting room becomes satisfactory to the power allowance. Lighting Circuiting Calculation For the lighting design in the meeting room, only one circuit is needed to carry all the design fixture s loads. *Please note that according to electrical standards commonly practiced in Canada, fluorescent fixtures are usually connected to a voltage of 347V Circuitng Calculation Fixture Input Watt # used Total Wattage Total Amps CJ1 40 1 40 0.115 CM1 13 18 234 0.674 FB1 54 24 1296 3.735 Total Amps 4.524 # of circuits 1 Table 6.4 ~ Circuiting Calculation for the Meeting Room 50
System Control The lecture hall will require to have the flexibility of at least three lighting scenes as it is one of the many multi-purpose rooms in the building. fixtures will be on/off, but can also control the dimming of different fixtures, providing that the fixtures are dimmable. Meeting o All lights on (CJ1, CM1, FB1) Audio/Visual Presentation o Only inner-cove on (CM1) Unoccupied/Nightlight o Only outer-cove on (FB1) Specification of control hardware ~ Meeting room ~ Lighting scene during an audio/visual presentation The change of lighting scenes in the lecture room will be controlled with the use of the Lutron GRAFIK Eye present lighting control system. This system allows the user to create and recall some custom preset scenes for common room activities. This control system not only controls which 51
Calculations and Renderings The illuminance level calculations were perfomed by Lightscape. The target illuminance for the horizontal workplane (during general meeting conditions) should be 30 fc, and an illuminances of 5 fc for the vertical surfaces. Below are some rendered views of the Meeting Room: 52
Below are illuminance distribution gradients of the lighting system in the Meeting Room. Analysis of the lighting system The use of cove lighting in two different areas within the Meeting Room emphasizes the geometry and curved surfaces of this uniquely shaped room. The light seeping in from the edges of the drop ceiling gives those surfaces a weightlessness, like they are floating in the surface. The elliptical shape of the new dropped ceiling echoes the shape of the elliptical conference table, connecting the architecture to the elements in the interior of the room. The pendant fixture in the middle of the room provide the much needed illuminance on the surface of the conference table (approximately 30fc or more). It also lets the occupants locate the center of the room, making it a focus area for their activities. Conclusion and recommendations Ovreall the lighting design for the Meeting Room is satisfactory. It provides the required illuminance for the tasks performed in this space while maintaining an aesthetic appeal to the space. It is done so by highlighting some of the special features of the room, such as ceilings, surfaces, and shapes within the room. 53