AT2 Lighting Study

Aims:1) To compare physical modelling to computer

modelling techniques

2) To use lighting data and findings to inform, alter and improve my design

3) Understand particular lighting requirements for different environments

Introduction:My main space is particularly relevant to the

lighting study, as it serves as a social / entrance space in the day time, and as a theatre/ performance

space at night. Therefore in the daytime I need to get sufficient light levels for reading tasks (500 lux minimum),

and also provide an element of drama and excitement as it is the main access space to my library. Also I need it

to be suitably able to provide lighting for small scale performances, so the digital testing of artificial lighting

will be good for this purpose.

Physical Model- Daylight TestingMy main aim is to test a number of different roof

types to see what the daylight quality inside the space is.

Cone Roof Daylight Factors

Ground floor

X 12.7%X 9.0%

X 8.0%

X 10.9%

X 7.9%X 5.8%

X 9.8%

X 6.3%

X 18.4%

X 4.4%X 1.8%

X 3.3%X 1.4%

X 2.8%

X 1.6%

X 3.8%

X 2.6%

X 3.1%

First floor

X 16.2%X 12.0%

X 14.6%

X 10.9%

X 8.2%X 8.8%

X 9.8%

X 10.3%

X 15.9%

X 6.4%X 1.9%

X 5.7%X 1.9%

X 5.4%

X 2.4%

X 4.6%

X 4.4%

X 5.7%

X 6.6%X 8.0%

X 2.8%

X 1.8%

X 2.9%X 5.9%

X 2.6%

X 2.1%

X 1.6%

X 1.2%X 0.5%

X 1.0%X 0.2%

X 0.9%

X 0.3%

X 1.6%

X 2.8%

X 1.9%

Octogon Roof Daylight Factors Light Scoop Roof Daylight Factors

Roof Type 1-Cone

200 lux (3% DLF)

400 lux (6% DLF)

600 lux (9% DLF)

800 lux (12% DLF)

1000 lux (15% DLF)

1200 lux(18% DLF)

1400 lux(20% DLF)

1m 3m 7m 11m 15m 19m

200 lux (3% DLF)

400 lux (6% DLF)

600 lux (9% DLF)

800 lux (12% DLF)

1000 lux (15% DLF)

1200 lux(18% DLF)

1400 lux(20% DLF)

1m 3m 7m 11m 15m 19m

200 lux (3% DLF)

400 lux (6% DLF)

600 lux (9% DLF)

800 lux (12% DLF)

1000 lux (15% DLF)

1200 lux(18% DLF)

1400 lux(20% DLF)

1m 3m 7m 11m 15m 19m

Roof Type 2-Octogan

Roof Type 3-Scoop

Ground floor Ground floor

Ground floor Ground floor

Physical Modelling Conclusion:

Note: Conclusion had been made with the addition of the results of the sunlight penetration testing on the following

page.

I found the scoop roof didn’t provide enough light in down to the ground floor, however it was interesting that it did provide a

gradient of light across the space, something that I may consider elsewhere. The octagonal roof worked well in

summer, with the light reflector bouncing light into the different floors. I however found it undesirable in winter

the amount of light penetration you got into those floors. The cone shaped roof provided great phenomena in

that a circle of light traced its way around the cone throughout the day, and washed down the north face. Also on the two floors, you got a crescent of direct sun

light that draws you towards the space.

Sunlight Penetration testing

9:00 am, June 21st

Physical Model

9:00 am, March 21st 12:00 pm, March 21st 4:00 pm, March 21st

9:00 am, Dec 21st 12:00 pm, Dec 21st 4:00 pm, Dec 21st

12:00 pm, June 21st 4:00 pm, June 21st

9:00 am, June 21st

9:00 am, March 21st 12:00 pm, March 21st 4:00 pm, March 21st

9:00 am, Dec 21st 12:00 pm, Dec 21st 4:00 pm, Dec 21st

12:00 pm, June 21st 4:00 pm, June 21st

Digital Model

Main Performance space- Artificial Lighting

Main Performance space- Natural Lighting

Spotlights used76655.000 Emanon SpotlightLED 14W 870 lm 3200KHousing colour Silver warm white, wide flood

Wall Washer Used75768.000 Cantax SpotlightLED 14W 1080 lm 5500KHousing colour Blackdaylight white, spot

Digital Model

My main goal for the digital testing is to compare the two modes of the space, in the open day-lit scenario, and the closed, artificially lit performance scenario. By now my design has changed in shape from my original physical model, but the lighting system remains the same and can still be compared.

I want to set up a performance space, therefore used spotlights, with wall washer lights that would be turned off during performances.

Light Meter Analysis

This data is very useful, as it shows me accuratelythe gradient of light levels achieved using the coneshaped roof that I liked from my physical testing. The promising this is that the levels were very similar to myphysical model.

Comparison Conclusion

Artificial Lighting Testing