ACOSHAPE Acoustic Lighting Case Study Document

Requirements General school areas such as; meeting rooms, offices, libraries and classrooms have to reach an illuminance level of 300lux. These areas should also have an uniformity ratio around the value of 0.8, and a glare rating around the value of 19. Fitting Using a direct/indirect suspended linear fitting, cased with the ‘BARCODE’ ‘Basotect absorption foam’ would create sufficient illuminance while lowering the need for acoustic absorbers throughout the room. Acoustics The maximum reverberation time for school buildings is dictated by the Building Bulletin 93 document. For a Secondary school (general teaching area) the maximum times are: New build ≤ 0.8s Refurbishment ≤ 1.0s

A simple layout of a primary school classroom is used as our first example. Acoustic lighting would be used in this classroom to lower the reverberation time to stay under the regulations specified. The ‘BARCODE’ and ‘DROP’ fittings are used here. Primary School Classroom

Here it is clear to see that the light is evenly spread across the entire space of the classroom giving an uniformity ratio value of 0.8. The average illuminance of this space is 427, which comfortably reaches the required 300lux for this type of working area. Also a glare calculation has been added, situated behind a random student desk with an output value of 17. This concludes that the direct/indirect suspended linear fitting is sufficient when used within the ‘BARCODE’ acoustic foam. Lighting Results

We can calculate the standard reverberation time (arithmetic average of the reverberation times in the 500 Hz, 1 kHz and 2 kHz octave bands) using a typical classroom of 8 x 8m and a height of 2.5m with carpeting, plastered masonry walls, wooden door large window with double glazing and a suspended ceiling. With no acoustic fittings the reverberation time is hitting over 2s. A clear improvement is made when adding the ‘BARCODE’ fitting that then meets the requirement for refurbishment. If we add further items (for example 16 Drop panels on the wall) then we meet the requirements for New Build. New build ≤ 0.8s Refurbishment ≤ 1.0s Acoustic Results Results500 Hz1000 Hz2000 HzAverage As a bare room with no acoustic fittings2.05s1.66s1.04s1.58s With 20 Acoshape+ Barcode 125’s light fittings1.15s0.98s0.72s0.95s With 20 Acoshape+ Barcode 125’s and 16 Drop panels on the wall0.94s0.80s0.62s0.79s Time (s) Frequency (Hz)

Using the same classroom, we have adapted the use of the ‘BARCODE’ fitting to create squares of linear light. More of this fitting is used, however, the ‘DROP’ acoustic panel fitting isn’t needed here to reach the reverberation requirements of ≤ 0.8s. Primary School Classroom

Here we can see that the fitting used has again, given adequate lighting levels. After rearranging the use of the ‘BARCODE’ we are able to stay within the requirements of a new build, but without the use of the ‘DROP’ wall panels. This shows that there is variation in how the acoustic fittings are used. New build ≤0.8s Refurbishment ≤1.0s Lighting/Acoustic Results Results500 Hz1000 Hz2000 Hz Average As a bare room with no acoustic fittings2.05s1.66s1.04s1.58s With 16 Acoshape+ Barcode 245’s light fittings0.93s0.79s0.62s0.78s Frequency (Hz) Time (s)

Open Bar / Restaurant Here is an example of an open plan restaurant with a bar and food area situated to the side. Acoustic lighting, such as the ‘GEO’, can be used above the bar area instead of normal light pendants.

Acoustics The images here illustrate the layout of the open plan. In lighting, different ‘zones/atmospheres ’ can be created. The image below demonstrates how the light differs from around the bar to the dining areas. GEO lighting will add improvement to the area locally. People sitting close to the light units will receive less reflected sound and therefore observe a lower noise intensity from the open areas. Also the speech and clear communication levels will be improved in these areas.

This is another example of a type of room that could have acoustic lighting introduced towards. This is a simple meeting room with dimensions of 10 x 8m. Casing the track with the ‘BARCODE’ fitting, the same way as in the classroom illustration. ‘DROP’ panels have been used here as well to help meet the reverberation regulations. Meeting Room

The regulations for this meeting room has been adapted from the following information from the Building Bulletin 93 document. Small lecture rooms for less than 50 people ≤ 0.8. Large lecture rooms for more than 50 people ≤ 1.0. Offices ≤ 1.0 Therefore, we are looking for a time around 0.9 which is accomplished. Lighting/Acoustic Results Results500 Hz1000 Hz2000 Hz Average As a bare room with no acoustic fittings2.07 s1.67 s1.04 s1.59 s With 4 Acoshape+ Barcode 245’s & 6 Acoshape+ Barcode 125’s light fittings 1.44 s1.21s0.84s1.16 s With 4 Acoshape+ Barcode 245’s, 6 Acoshape+ Barcode 125’s & 17 drop panels 1.16 s0.98s0.72 s0.95 s Time (s) Frequency (Hz)