Lighting Depth Part 1: Exterior Space Metaphor and Ideas: The first space of my lighting redesign is the front façade of the Recreation Center shown below. Metaphorically, I want the front porch to act as a beacon, or guiding light to the entrance of the Recreation Center. I wanted to draw attention to the front porch by making it glow, since it is the area through which one first enters when going to the Rec Center. There is a sidewalk and road that wraps around in front of the Rec Center, plus several small areas of landscaping that need to be highlighted. Since there is a translucent skylight over the porch, I wanted to avoid any fixtures that would throw light upward to avoid light pollution. For the rest of the front exterior, I wanted to create a streetscape theme with the sidewalks and pathways clearly defined since the center is open until late at night. Currently, there is no distinction between the road and the sidewalk so I wanted to add fixtures that made the separation. Design Criteria: Very Important: Since the porch is the main entrance to the building and has a high level of pedestrian traffic, modeling of faces, peripheral detection, color appearance and shadows must be addressed in this area. The building is open until 10:00 p.m. at night, so security is a concern. A horizontal illuminance of 5 footcandles and a vertical illuminance of 3 footcandles is required near the entrance. Since I am dealing with the exterior, light pollution is always an issue. Aesthetically, the building s architecture deserves some kind of emphasis so the light distribution on the sandstone and brick is an issue, as well as the appearance of the façade and it s luminaires in general. Surface Characteristics: Brick: ρ 30% Sandstone: ρ 40% Parts of the exterior front façade consist of sandstone, while other parts consist of brick. The front porch itself is sandstone, with brick at the base. - 7 -
Photographs and Location: Exterior Porch Front Porch Looking up Exterior Front Façade - 8 -
Design Ideas: I used metal halide bollards to mark the sidewalk and paths, inground wallwashing floodlights to create patterns between windows on the façade, and davit mounted 16 pole fixtures to separate the sidewalk from the front drive-around and create the streetscape theme. Within the porch, I hung metal halide pendants at 3 feet, which was high enough to illuminate the upper portion of the porch, while providing direct downlight to the concrete floor. LIGHTING FIXTURE SCHEDULE - EXTERIOR LABEL FIXTURE DESCRIPTION LAMPS INPUT WATTAGE BALLAST A Louis Poulsen AH Nyhavn Area Light HID fixture with a full cutoff conical shade on an 18 foot pole with a davit mount. 1-175W MH: Philips Product Number 046677-24725-4 205 Advance Transformer Catalog Number 72C55H1 B Louis Poulsen Pharo Inground Wallwasher HID accent fixture that creates a narrow asymmetrical wallwashing effect with a heat tempered impact resistant clear glass lens 1-70W T6 MH: Philips Product Number 045577-22337-0 90 Advance Transformer Catalog Number 71A52M1 C Louis Poulsen Orbiter Bollard HID aluminum open-top reflector with antiglare ring to shield lamp from direct view - provides an even downward distribution all the way around 1-100W MH: Philips product Number 046677-23368-4 118 Advance Transformer Catalog Number 71A5337BP D Louis Poulsen Nyhavn Maxi Pendant HID pendant mounted fixture that creates general downward illumination by means of a spun aluminum conical shade. 3' suspension length. 1-100W MH: Philips product Number 046677-20888-4 118 Advance Transformer Catalog Number 71A5337BP Exterior Lighting Fixture Schedule - 9 -
Fixture Location: Fixture Location Diagram Location: The porch pendants are spaced 11-3 from center to center. The bollards to the left of the porch on the diagram are spaced 33-8 from one another, wile the bollards around the curve to the right of the porch are spaced 23-9 from one another. The davit-mounted post fixtures are spaced approximately 36-0 from one another. The inground fixtures to the left of the porch are spaced at 19-9 from one another while the fixtures to the right of the porch are spaced 15-5 from one another. Fixtures on the roof are placed 10-11 from one another with the exception of the fixture on the far left. - 10 -
Equipment: - 11 -
Circuitry and Controls: Exterior Circuiting Diagram I selected the Outdoor Controller from Wattstopper to control the exterior lighting loads (Poles, Inground fixtures, bollards). The Outdoor Controller uses the exterior photocell sensor to read light levels and transmit the data to the controller module. The photocell will be mounted on the porch roof, which faces the northern sky. Model Numbers: Controller Module (HPCU3BC) and exterior photodiode photocell sensor (HPSA) - 12 -
Illuminance Results: Porch Floor: Avg. = 8.83 fc Porch Floor: Avg. = 15.3 fc Max. = 11.5 fc Max = 106.8 fc Min. = 0 fc Min. = 2.4 fc Sidewalk: Avg. = 4.9 fc Max. = 29.3 fc Min. = 0.3 fc Driveway: Avg. = 2.5 fc Max. = 16.3 fc Min. = 0.8 fc - 13 -
Exterior Renderings: - 14 -
Color Illuminance Contour: - 15 -
Exterior ASHRAE 90.1 Requirements: Nyhavn Area Fixtures: (205 W/fixture)*(7 fixtures) = 1435 Watts = 1.435 kw Orbiter Bollards: (118 W/fixtures)*(17 fixtures) = 1652 Watts = 1.652 kw Pharo Inground: (90 W/fixture)*(15 fixtures) = 1350 Watts = 1.35 kw Nyhavn maxi Pendant: (118W/fixture)*(2 fixtures) = 236 Watts = 0.236 kw Canopy Porch Area: 605 ft 2 Canopy Porch Power Density = 236 Watts/605 ft2 = 0.4 W/ ft 2 Front Façade Wall Area: 5332 ft 2 Front Façade Power Density: 1350W/5332 ft2 = 0.25 W/ ft 2 From ANSI/ASHRAE STANDARD 90.1-1999 - Table 9.3.2: The allowable power density for a building entrance with a canopy is 3W/ ft 2, so 0.4 W/ ft 2 is significantly under this requirement. The allowable power density for façade area is 0.25 W/ ft 2, so the power density for my façade just meets this. - 16 -