Distribution of Data Cable. Distribution of data cable may be
accomplished by any of the methods listed in Paragraph 4.4.1, with the
exception that some equipment manufacturers may not endorse flat cable.
Installation of Local Area Network (LAN). There are two methods of
installing LAN: general contractor provides the wire distribution system only
(the actual data cable is provided by the equipment installer) or the general
contractor provides the complete LAN including distribution system and wiring.
Lighting. Provide energy efficient lighting in accordance with the
design criteria in MIL-HDBK-1190 and NAVFAC DM-4.04.
Lighting Design Application. In administrative facilities, the
emphasis should be placed on the design application. Consider the quality of
the light as well as the quantity of light. Avoid excessive amounts of
Video Display Terminal (VDT) Area. Avoid high lighting contrasts in
VDT use areas. The brightness ratios between the keyboard, the screen of the
video display terminal, and surrounding surfaces should be 1:3:10,
Reflectance Values. Select materials with reflectance values as
follows: walls 40-80 percent, furniture/vertical surfaces 40-70 percent,
worksurface 30 percent maximum, ceilings 80-90 percent, floors 20-40 percent.
Location of VDT Terminals. When placing VDT terminals in the office
environment, locate the VDT screen perpendicular to the window plane; locate
light fixtures to reduce reflections in the screen (Figure 4).
Lamps. Select energy-efficient, long-life lamps with color
temperature in the 4,000 degree Kelvin range.
Consider ease of accessibility for bulb replacement
General (Ambient) Lighting. General (ambient) lighting can be
provided by fixtures that direct light directly into the space (direct
lighting) or by reflecting the light off of a surface such as the ceiling
plane (indirect lighting).
Recessed Ceiling Fixtures (Direct). Use energy efficient fixtures
with low brightness lenses or parabolic baffles to reduce glare (Figure 5).
Baffled Ceiling Fixtures (Direct). Locate fixtures in the ceiling
above a reflective baffle system; this system can also conceal mechanical
systems and provide additional acoustical control (Figure 6).
Pendant Ceiling Fixtures (Indirect or Direct). Fixtures suspended
below the ceiling can provide excellent indirect light quality. Correct
spacing between fixtures and distance from the ceiling plane will ensure even
distribution and minimize hot spots. Direct down light components provide
selected accent lighting (Figure 7).