Appendix I 1.7 LIGHTING

I.7 LIGHTING

I.7.1 GENERAL

In the work environment, people tend to have more job satisfaction if they have some contact with natural light through windows, skylights, atriums, and the use of full spectrum light sources. When properly designed and effectively integrated with the electric lighting system, daylighting can offer significant energy savings by offsetting a portion of the electric lighting load. A related benefit is the reduction in cooling system capacity because the electric lighting operates less, lowering a significant component of internal gains. See Appendix D for more daylighting information. A lighting system made up of layers of ambient light, task light, and accent light improves the visual comfort in a space, as well as reduces the amount of lighting energy used. Accented interest can be achieved with coves, soffits, up-lighting, recessed fixtures, or with wall mounted fixtures such as sconces rather than just the typical 2’ x 2’ fluorescent fixtures. In every case, energy consumption shall be considered in the design and energy consumption minimized by using the most energy efficient fixtures and materials that will satisfy the design requirements. Lower light levels with appropriate task lighting should be considered. LEED™ provides credits in Sustainable Sites, Energy and Atmosphere, and Indoor Environmental Quality categories for sustainable options that could be relevant to lighting and lighting controls selection.

Corridor lighting needs to be carefully planned to avoid accentuating the length of the corridor. Lighting shall not create heavy shadowing, but will have both ambient and accent type lighting.

Dimming shall be provided in most areas. Use a 10-5% capability for general use, lower for conference rooms. Turn know dimming switches are not allowed. A slide switch with an on/off button is preferred.

I.7.2 LAMP USE GUIDANCE

Guidance on lighting selection and use can be found in Appendix D.

Incandescent: Do not use except in special situations.

Tungsten: Only for important accent areas such as art. Try not to use since they are high maintenance.

Mercury: Not encouraged.

Fluorescent: Use as much as possible.

Metal Halide: Use for outdoors. Use for high ceiling garages or hangars.

High Pressure Sodium (HPS): Outdoors only.

Induction: Outside only. Use in place of metal halide or High Pressure Sodium (HPS).

I.7.3 INCADESCENT

Use incandescent lighting for lamps, vanity lights, wall sconces. Energy efficient fixtures and/or fluorescent bulbs are preferred and should be considered to replace incandescent lamps.

Exceptions may be for:

Dining rooms.

Lodging rooms.

Food preparation areas.

Housing.

Vanity sinks and mirrors in restrooms.

Used incandescent bulbs in areas where true color rendition is important.

I.7.4 FLUORESCENT

There are now many different styles of bulbs that will suit various needs and different types of fixtures. All 2’ x 2’ or 2’ x 4’ fixtures will have 2” square parabolic lenses. Do not use acrylic. T-8 lights should be used in lieu of T-12.

Finishes:

Housing to be white baked enamel steel.

Lens to be semi-specular, clear anodized aluminum.

I.7.5 Occupancy Sensors

Ceiling mounted occupancy sensors.

Under cover switch with delay of 30 seconds to 15 minutes.

Detector must be of passive infrared (PIR), ultrasonic, or a combination of both.

Ultrasonic and infrared devices must be equipped with a sensitivity adjustment.

Sensor must have positive detection device, LED or equal.

5 year warranty

I.7.6 SPECIALTY

Specialty fixtures such as decorative pendants, display/art spotlights, wall sconces, etc. can be used to add interest and break up the lighting patterns in a space.