Title: Title Reading Assignment
Course: WGF 107 DEVELOPMENT > Section: Content

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Sub-Title | Retrofits and De-lamping
Content
De-lamping is the simplest and yields improved energy

savings along with visual comfort. This practice involves the removal of a lamp or lamps from multiple-lamp fixtures (for example, converting a 4-lamp 2 x 4 fixture

to a 2 lamp 2 x 4 fixture). Areas that are typically overlit include public spaces, corridors with outside windows (in daytime), hallways, kitchens, storage areas, and meeting spaces. Even laundry areas can be overlit.

Following the IESNA recommendations also allows the ambient light levels in public areas to be reduced or turned off if sufficient daylighting levels are available. Where possible, lighting levels in areas such as interior hallways (where no natural light is available) can also be reduced, yielding additional savings. If you choose to practice de-lamping, remove lamps in a uniform fashion to eliminate

“dark spots” and ensure that the remaining light levels are sufficient for the tasks or occupants. In addition, de-lamping is most effective when the remaining lamps and ballasts are still matched. Depending on the existing wiring, some ballast can consume as much energy with a partial load as with a full load. Additionally, de-lamping can be effectively combined with a campaign to clean or paint interior walls with a lighter color in order to maximize the illumination level and occupant comfort.

Applying measures other than re-lamping ideally requires the services of qualified lighting experts who can address both light distribution and quality criteria. In addition, depending on the scale, replacement of existing systems can also require compliance with energy codes governing energy use and lighting installations for new and retrofit facilities. Finally, user interaction and feedback provides some indication of light levels and quality. Complaints such as glare or flickering can indicate too much light or poor quality light. Working with users can help increase understanding and acceptance of implemented measures.

Plan for Group Delamping

In many cases, the most cost-effective way to maintain a lighting system is a planned program of group delamping, in which all lamps are replaced in the same operation. This practice is in contrast to spot delamping, in which lamps are replaced only when they burn out.

·        On a per-lamp basis, group delamping requires much less labor than spot delamping because

the maintenance workers have all the required materials on hand and can move systematically from one fixture to the next. In addition, group delamping is normally done outside working hours, which reduces disruption of normal activities.

·        It is an easy task to schedule and to delegate to outside contractors who have special equipment and training. Group delamping provides brighter and more-uniform lighting because it gets rid of lamps before they are at the end of their lumen depreciation curve.

·        It offers increased control over the replacement lamps, reducing the probability of mixing incompatible lamps, such as those with different color temperatures.

·        Other maintenance activities can be combined with group delamping, such as ballast and reflector inspection and lens cleaning. It also provides an opportunity for retrofitting reflectors, lamps, ballasts, or lenses as necessary.
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Attributions | Image and Content courtesy of Building Upgrade Manual – ENERGY STAR® Content courtesy of Building O&M Manual (Chapter 4) – Green Seal, and Building Upgrade Manual  - ENERGY STAR®