Thursday, November 12, 2009

Lighting installation design

This post used to contain a sample need statement for office building lighting design. It was the kind of need statements that are provided to design-and-build contractors or turnkey contractors during the initial stage, when the contractor was invited to submit a proposal.


Photo 1: Recessed lighting

Need statements like this provide a basis to indicate the approximate scope of works and also the standard of installation required by the building owner of the proposed new building.

However, after analyzing the traffic to this blog, I realized that only very few visitors were interested in the content of this post.

When I uploaded the original post, I had an intention to use it as a starter post from which I could link up to more posts and pictures about lighting design and installations.

The sample need statement would not be changed since someone might need it.

Since there seemed to be little interest in the materials, I have made a decision to just use the article of the need statement as an anchor post to link up to pictures and other articles on lighting.

Because of that, the format of the need statement will not be of a need statement any more.

It will be more convenient and faster for me, however, to link up to other posts on lighting in this way.

I have tons of posts to upload to this blogs, but I usually don’t have enough time to write something about it.

I need a method that does not require too much time writing.

So as you scan through this post downward, you will see the links to other posts that contain more photos, diagrams or articles. Follow the link and then come back here for more links.

What I mean is that I will be adding more links to this post in future, using it as an anchor post for lighting designs and installations.

Internal Lighting installation

The illumination levels shall generally be in accordance with the IES Codes, CIBSE Code for Interior Lighting and Lighting Guide 3 (LG3) and the current practices.

As reference, the general installed illumination levels at some of the areas/rooms shall be as follows:

a) Office, reception areas, waiting areas: 300 lux
b) Computer rooms: 500 lux
c) Lecture / Teaching places: 300 lux
d) Circulation areas: 100 lux
e) Electrical / telecommunication switch rooms: 300 lux
f) Areas for rough work: 200 lux
g) Areas for medium work: 400 lux
h) Areas for fine work: 600 lux
i) Internal corridors: 100 lux
j) External corridors: 30 lux
k) Street / compound lighting: 15 lux
l) Multi purpose hall: 500 lux

The lighting systems shall be designed by arrangement of alternating circuits, proper grouping of lighting switches, separate switching etc. so that unnecessary light fittings can be switched off as desired.

Thus the concept of energy saving shall be considered in the lighting system design.

The luminaries shall generally be of the following types:

1. Air-conditioned areas – Recessed fluorescent fittings with full aluminum parabolic reflectors and louvers complete with hinge for easy maintenance or whichever is appropriate.

2. Non air conditioned areas – Recessed fluorescent or surface mounted fluorescent fittings with full aluminium parabolic reflectors and louvers complete with hinge for easy maintenance.

3. Computer / data processing rooms – Recessed fluorescent fittings with full aluminium parabolic reflectors and louvers complying with CIBSE LG3 or Cat. 2 whichever is appropriate, complete with hinge for easy maintenance.

4. Corridors – Suitable types of recessed or surface mounted fluorescent fittings with full aluminium parabolic reflectors and louvers complete with hinge for easy maintenance, OR suitable type of recessed or surface mounted down lighter with energy saving discharge lamp, whichever is appropriate.

5. Store rooms / toilets – Suitable types of fluorescent fittings, OR suitable types of recessed down light with energy saving discharge lamp.

6. Meeting rooms / conference rooms – Same as office areas but supplemented by PAR down lights c/w dimmer.

7. Plant rooms – Suitable types of fluorescent fittings.

8. Other areas – Suitable types of light fittings.

9. Multi purpose halls – Suitable types of light fittings supplemented by PAR down lights c/w dimmers.

10. Walk path, garden and parks – Suitable types of foot path lantern c/w miniature PL/SL lamp with suitable height, controlled by time switch and/or photo-sensitive sensors whichever is appropriate.

11. Street / compound – Suitable type post with top or side entry SON fitting mounted on/in galvanized/ aluminium/ fiberglass/ composite die cast/ concrete R.C. poles of suitable height controlled by time switch and/ of photo-sensitive switch whichever is appropriate.

Luminaires for special requirements and areas:

1. Gallery/ exhibition/ showcase areas – Suitable decorative fitting, track lighting c/w ultraviolet filters to protect the exhibition materials.

Exit lights and self contained emergency lights of fluorescent type with three hours battery reserve shall be provided for all areas in accordance with the requirements of the Fire Department.

Suitable self contained emergency lights with sufficient lighting level for normal operation and with minimum three hours battery reserve shall be installed in staircases, public areas, electrical/ telecommunication switch rooms, riser rooms/ areas and other rooms/ areas in accordance with the requirements of the Fire Department.
Fluorescent tubes installed shall be of deluxe type with color temperature of approximately 4000 degrees K similar to Philips code 84. External street lighting, compound lighting and flood light shall be of SON type.

Lighting for walk paths shall be of miniature fluorescent lamps such as PL lamps. Ballast loss for fluorescent fitting and compact fluorescent / down lights shall be 6W loss. Insect fittings shall be installed at kitchen, cafeteria and other area as specified by Project Director/ Project Director Representative.

The common corridor, public areas etc. shall have two levels of illuminance (evening/ night) such that after midnight the lighting cab be reduced to a lower level.
The switching of these lights shall be by automatic time switches complete with 24 hours battery reserve and manual override or by other appropriate methods.

Depending on the functions of the department/ areas, some of the light fittings shall be connected to the essential circuits.

Suitable and adequate number of outdoor lighting with SON/ Metal Halide shall be provided for games courts such as badminton courts, squash courts, volley ball courts, etc.

External Lighting Installation

All works shall comply with the requirements, rules and regulations. They shall also follow the relevant latest circular for external lighting.

External lighting installations shall consists of Street Lighting, Compound Lighting, Garden/ Landscape Lighting, Sport Lighting, Area Floodlighting, Security Lighting, Fence Lighting, Façade Lighting, etc.

Compound/ street lighting shall be provided for the compound and internal roads within the compound of the project. The compound/ street lighting shall be mounted on galvanized/ aluminium/ fiber glass/ composite die cast poles/ concrete R.C. poles not exceeding 3.0 meters in height for compound lighting and 8.0 meters for street lighting. Wall mounted light fittings shall be used where pole mounted light fittings are not suitable.

Generally, the spacing between the poles shall not exceed three times the mounting height of the pole. The lamps for the light fittings of SON type. The illumination level on the ground/ road surface shall not be less than 1.5 lumens.

Suitable path lighting with PL lamps shall be provided in the parks and gardens and at the walk paths.

Suitable lightings shall be provided for guardhouse, signage, front fencing, etc.

Area floodlight shall be provided where necessary.

Suitable lighting with SON/ Metal Halide lamps shall be provided for games courts such as tennis court, badminton courts, volley ball courts, etc. The light fittings shall be on hot dipped galvanized steel poles/ concrete R.C. poles with climbing rungs and easy maintenance, etc.

All external compound/ street/ flood/ path lightings shall be provided with time switches and manual bypass or by other appropriate methods for automatic and manual switching. The lighting systems shall be of such design so that after midnight the lighting levels can be reduced if required.

Façade lighting consisting of floodlights, directional lights, etc. shall be provided to enhance the façade of the buildings.

Copyright - Lighting installation design

No comments: