Bolton Priory Internal Lighting Project Lighting Design Concept - - PowerPoint PPT Presentation

Bolton Priory

Internal Lighting Project Lighting Design Concept Presentation 3504_P_140924

Lighting Design Concept Report The PCC have commissioned a report into the condition of the existing lighting and requested an initial view of the potential of relighting the interior of Bolton Priory Church. A preliminary presentation was submitted on August 30th 2014 after a site meeting with members

• f the PCC and DAC.

Following very helpful feedback from both the parish and DAC the report has been now amended and further clarification added, particularly in respect the provision of reading light for both the congregation and choir. This presentation constitutes a Lighting Design Concept Report. It is hoped that this will receive continued support from the parish and DAC. The natural progression from this level of information would be to commission a mock-up of the key lighting elements for final approval by the parish. This would then allow the designers to proceed to a detailed design and specification for the complete package of works allowing competitive tenders to be sought from suitably experienced specialist lighting and electrical contractors.

Bolton Priory

Internal Lighting Project Introduction

Lighting Design Concept Report The presentation starts with illustrations showing the history of lighting in the church – from oil lamps to the present day – and then moves through a review of the present lighting, the established client brief and Statement of Need to a short options appraisal. The Lighting Design Concept is then presented. We use simple CAD and rendered images to portray the concepts. These are intended to be indicative rather than a comprehensive representation and therefore it is recommended that the PCC consider an in situ demonstration of the key elements of the design so that they can be properly evaluated as part of the detailed design process. The report includes design details for bespoke and conventional light fittings as well as the overall strategy for relighting the church.

• A set of CAD drawings is also provided in pdf format to further illustrate the design concepts.
• Photometric plots are provided to illustrate reading light in the nave and choir.

At this stage it may be assumed that all of the new lighting will employ the latest LED light sources which will be fully dimmable and controlled by a preset lighting control system. This will ensure a low energy, low maintenance and easily operable installation.

Bolton Priory

Internal Lighting Project Introduction

Historical Images

Historical Images

This engraving from the early/mid 19th century shows the view looking west from behind the screen that now stands at the west end of the church. The screen was originally built along the line of the current steps from nave to chancel.

Early C 19th No visible lighting

Historical Images

This photograph from the early part of the C20th (pre WWII) shows a series of oil lamps mounted as standard lamps within the pew benches. The mounting holes through the book rests are still in evidence today.

Early C 20th Oil lamps amongst the pews

Historical Images

This post WWII image shows what is assumed to be the first electric lighting installation in the church. Simple pendants are suspended from short scrolled jib brackets mounted on fixing plates formed around the shafts of the columns

• n both sides of the nave.

Note that George Pace’s sanctuary gates indicating that these pendants predate Pace’s work in the church.

Later-mid C 20th Early pendants on brackets

Historical Images

This photograph from the later part of the C20th but before 1985 shows the choir stalls before the existing reading lamps were installed.

Pre 1985 Before choir stall lights

The Church Today

The Church Today

This recent photograph shows the pendants that replaced the simple shades shown on the earlier slide. Clearly late 20th century, the shades are straight sided and obviously “of their time”. The light sources are of a compact fluorescent type [CFL] and emit a poor quality

• f light at intensities that are clearly below the

levels required for modern uses of the church. It can be seen that there are a number

• f lamp failures as well as some lamps that are

simply not as bright as others.

Replacement pendants

The Church Today

This photograph shows the church lit with a number of low pressure sodium [LPS/SON] uplights. These fittings, in various forms, are used through the church on the north and south side window ledges, behind the altar, at the west elevation and also at low level in the tower entrance. The dull orange glow that results was widely used in the latter part of the 20th century to “warm the feel” of an interior. Today these light sources are considered to be of poor quality as they tend to discolour the interior and are of inconsistent colour and intensity.

Sodium uplighting

The Church Today

This photograph shows the reading lights added to the choir stalls in the 1980s.

1985 Choir stall lights

The Statement of Need and Liturgical Context The Statement of Need sets out the following requirements:

• Obvious need to improve the internal lighting of the church
• Suitable lighting for celebrants, choir and congregants
• Requirement to cater for concerts and community events

A review of the current installation highlights:

• A need to address concerns of electrical safety
• Switchgear does not meet current regulations
• Many luminaires are not in a serviceable condition
• Some light sources are highly inefficient
• Some lamps are becoming obsolete

Additional requirements:

• Lighting should support more diverse use of the church
• Facilities for concerts and festivals and wider community uses
• More subtle architectural modelling and uplighting to improve interpretation of the heritage
• Flexibility for exhibitions and other displays

Energy and maintenance targets:

• Energy efficiency could improve five fold by the use of LEDs
• Maintenance burden reduced by 90% due to longer life LEDs

Operational targets

• Simplified operation through preset control with some manual over ride.

Fixed control points for normal use Wireless controls for more sophisticated uses

• Integrated emergency lighting

The Church Today Design brief

Fundamental Design Options Discussions with the client group and a DAC visiting party reviewed the following options:

• 1. Replace pendants on the existing wall brackets
• Would maintain current style and appearance
• However the existing positions do not facilitate an even spread of light

across the nave

• Much larger fittings would be required to produce sufficient levels of

illumination

• There would be a lack of flexibility for more diverse uses of the church
• 2. Consider new pendant hanging from the ceiling:
• Would provide more even illumination
• Fittings would be large and represent a significant new intervention
• There would be a lack of flexibility for more diverse uses of the church
• 3. Consider a high level spotlighting scheme with fittings on the cross beams:
• Would provide full flexibility for a wide variety of uses
• Would complement new uplighting at triforium/clerestory levels
• Would provide flexibility for exhibitions and other displays
• Access for maintenance would be at high level but infrequent, coinciding

with periodic cleaning and maintenance requirements.

• Meets requirements of the Statement of Need
• Wall bracket fittings to be removed do not appear to be of significance

Option 3 – a high level spotlighting scheme was the option preferred by the group

The Church Today Options appraisal

The Design Response CAD Drawings

Uplighting to internal entrance Standard lamps with up and down light in tower Uplighting to west window in tower New exterior lanterns All groups or elements to be independently controllable

The Design Response Low level plan layout

Uplighting to north aisle arcading Downlights to north aisle Accent lighting to north aisle features Replacement choir stall lights to be considered All groups or elements to be independently controllable

The Design Response Low level plan layout

The Design Response High level plan layout

Accent light to points of focus Downlights to pews - grouped from west to east Uplighting to west elevation Uplight to east elevation Uplights to ceiling and north elevation Uplights to ceiling and south elevation All groups or elements to be independently controllable

The Design Response

High level downlights Uplights to east end Uplights to nave ceiling, triforium and clerestory Uplights to arcade

Sectional view showing heights of uplights and downlights

The Design Response Illumination visuals

Looking south east

Wall brackets removed

Uplight to east elevation arch

Uplight to ceiling from north and south sides

Uplights to south elevation

Uplight to north aisle arcading

Composite view

Photograph extrapolated to show ceiling

Reading light for the congregation

Reading light for the choir

Reading light for the choir

Accent light to chancel step

Accent light to pulpit

Accent light to lectern

Looking north east

Wall brackets removed

Uplight to north aisle arcading

Accent to north aisle features

Looking north east

Composite view

Looking north east

Tower looking upwards

Uplight to window details

Floodlights uplighting tower ceiling

Combined uplighting

Tower looking upwards

The Design Response Illumination sketches

Internal section

Typical downlight to congregation

Typical reading light to choir

Accent light to east end

Uplight to east elevation arch

Uplight to nave ceiling

Uplight to north aisle arcading

Accent to north aisle features

Uplight to north and south elevations

Uplighting : composite view

The Design Response

The following photometric plots are based on a simple model of the church. Generally the performance and evenness of distribution will be dramatically improved from these predictions by careful focusing and the use of louvres and filters;

• the properties of which are outside the scope of this model.

These plots should therefore be considered as indicative rather than accurate predictions.

Photometrics

Photometrics Nave downlights from high level – maximum average illumination circa 200 lux

Photometrics Choir downlights from high level – maximum average illumination circa 300 lux

Photometrics Chancel step accent light from high level – average illumination maximum of 300 lux

Photometrics High Altar accent light from high level – average illumination maximum of 300 lux

The Design Response Typical luminaires

Tower Standard Lamps – preliminary sketch

High level spotlight (115mm diameter)

Low level spotlight (60mm diameter)

Window spotlight

Arcade uplight

Linear LED system