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Building Design & Energy Use
3. Daylighting and Interior Lighting
Resources
- There are many ways to daylight buildings without relying
on skylights or sunny days! Only 25-40% of the wall area
needs to be windows and opaque glass is better than clear.
- Employees in spaces with windows spend 15% more time on
work-related activities than people in windowless offices.
- The Superior Die Set Corporation of Oak Creek, WI upgraded
lighting for $3,000, providing annual energy and maintenance
savings of $1,750. Improved light quality allowed drafters
to cut turn-around time for drawings by more than 11.3%,
worth $37,500 a year, reducing the payback to less than
one month.
- Hyde Tools is a Southbridge, MA manufacturer of industrial
cutting blades. The company implemented a $98,000 lighting
upgrade from old fluorescents to new high-pressure sodium-vapor
and metal-halide fixtures. With the new lighting, workers
were able to see small particles that were causing defects
in their high-precision blades. Hyde Tools estimates the
improved product quality is worth another $25,000 a year
- bottom-line savings that are critical to a small company.
Hyde says every dollar saved on the shop floor is worth
$10 in direct sales, meaning the quality improvements were
worth the equivalent $250,000 in added sales.
- Energy
Center of Wisconsin's Daylighting Collaborative
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Daylighting and efficient interior lighting reduce energy use and
create a pleasant, productive work environment.
- Maximize daylight in your building through the appropriate use
of the following strategies (LEED™):
- Maximize window height, and use roof monitors, clerestory
windows, skylights, and light-pipe technology to transmit light
to spaces not reachable by other means.
- Balance glazing color for view, daylight and energy performance.
Note that City of Milwaukee zoning ordinance requires that street
level glazing must be at least 65% transparent.
- Use interior windows, light shelves and low partitions to
bring daylight deeper into the space, manage glare, and balance
light levels.
- Use south-facing windows with appropriate overhangs to reduce
summer sun and admit winter sun.
- Supplement daylighting with highly efficient electric light
distribution that improves visual quality while reducing electricity
use. For instance:
- Rely on low ambient lighting levels for general illumination
(predominantly light reflected from the ceiling where achievable)
boosted by high quality, flexible task lighting. For general
office space and non-critical manufacturing task areas, consider
achieving a lighting power density (LPD) goal of between 0.8
and 1.0 watts/ft2.
- Use high efficiency lamps and luminaires with electronic
ballasts.
- Employ efficiency-based controls such as dimmers, occupancy
sensors, and lumen maintenance controls.
- Wire luminaires parallel to walls with windows so they
can be dimmed or turned off by row.
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