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NON PRIME HOURS ILLUMINATION
640 650 6m 470 6m L90 7m 710 720 730 '740 ISO )m 170 7m 7m Bm 810 020 Bm 040 850 9m 870 am 090 9m 910 9I0 930 9.0 950 960 9R1 9m 990 •Im0 •1010 10 1030
r 'Specifier Spotlight
Metal Halide Lamps vs. High Pressure Sodium
PRODUCT FEATURE
METAL HALIDE
HPS
White Light
✓
Compact Size
✓
✓
High Efficiency
✓
✓
Long Life
✓
✓
Versatility
✓
✓
Environmentally Friendly
✓
✓
Life Cycle Cost
t✓
✓
Metal halide and high sodium pressure lamps share much in common. They are both highly efficient,
compact, long life light sources which are relatively immune to ambient temperature effects. Both tech-
nologies represent good choices from an environmental standpoint as they are efficient light sources
which deliver more light for less power consumption. They are both available over a wide range of lumen
packages and wattages.
The main and most observable difference between these two lighting technologies is the color and quality
of light which they are able to deliver. High pressure sodium lamps are yellow (2200K) and have a very
poor color rendering index of 22. Metal halide, on the other hand, is capable of delivering to the user a
white light in the range of 2700 to 5500 Kelvin with typical CRls in the mid 60s to mid 70s. Some lamps
chemistries even obtain CRis in the 80s.
High pressure sodium lamps are available in color corrected versions which shorten the life and only
slightly improve the color temperature. Even though the CRIB are greatly improved, the color temperature
still remains yellow. This limitation on color is present because the high pressure sodium lamp is generat-
ing color through the excitation of sodium. Metal halide lamps, on the other hand, generate their color
through the excitation of 2 to 5 different chemicals in the arc tube. By varying the blend of chemicals
metal halide engineers are able to alter the characteristics of
the light output. It is this flexibility in design which makes
metal halide so versatile.
White light is a very important attribute of metal halide tech-
nology. Because people prefer to work and live under white
light, these sources dominate the lighting market. High pres-
sure sodium is mainly used in areas where color temperature
and color rendition are not that important (i.e. warehouses,
street lighting, security lighting). Metal halide is found in
almost all general lighting applications and offers to the people
using the space an excellent quality of light. The introduction
of lower wattage metal halide lamps over the past decade has
greatly increased its application to indoor commercial and
institutional spaces.
16fl
. a
Fluorescent Lamps
Color Rendering Index (CRI)
CRI describes the ability of the lamp to render a natural appearance to
room decor, flesh tones, or furnishings with as little distortion as possible.
In general, the higher the CRI lamp rating, the more natural the colors
of objects will appear. Therefore, lamps with ratings at the higher end of
the CRI scale provide the best possible combination of the correct light
source and illumination values. CRI is measured on a scale of 0 to 100
with typical CRI falling between 60 and 80. Sylvania Octron Fluorescent
lamps and Designer 800 Fluorescent lamps, for example, both have
color rendering indexes of 80 and achieve excellent overall appearance.
CRI should only be compared with lamps of similar color temperature.
55-65 65-70 70-90
Fair Better Best
METAL AALZDE (�'S C.R.r.
.Z 2 CR.-Z.
11
37
High Intensity Discharge
0
High density discharge, HID, lamps produce light differently than both
incandescent and fluorescent sources. HID Light is produced by the passage
of an electric current through a gas or vapor under pressure.
There are four types of HID lamps. They are High Pressure Sodium, Mercury,
Metal Halide and Low Pressure Sodium. Most commonly used lamps in the
consumer market are 50 watt and 70 watt High Pressure Sodium, 175 watt
Mercury and a 175 watt Metal Halide. These lamp types are typically not used
for indoor residential lighting applications. All HID lamps require an initial
starting time of three to five minutes to reach maximum light output and if shut
off they can take up to ten minutes to restart.
The quality of light produced by HID lamps varies by type. High Pressure Is
Sodium produces a yellow -orange color of light and Mercury produces a blue
color of light. Typical applications include street and security lighting. Metal
halide lamps are used where the quality of light is more important. Typical
applications include retail store and security lighting.
HID Lamps should only be used in a fixture specifically designed with a
ballast for the particular lamp type and wattage.
54
Light Levels of Existing Dealerships
04/20/98
HIGHEST/LOWEST FOOTCANDLE READINGS
TEST EQUIPMENT.• ILLUMINOMETER MODEL #RCC-340 DIGITAL LIGHT METER
DEALERSHIPS
TIME 20' OFF PROPERTY LINE EXISTING SIDEWALK
FRONT ROW
HIGHEST/LOWEST HIGHEST/LOWEST
HIGHEST/LOWEST
Dellenbach
Chevrolet
8:55pm 3.7 1.3 21.7 / 3.5*
31.6 / 6.7*
Dellenbach
Subaru
9:15pm 1.6 / .2 6.7 / 3.1
78.9 / 12.2
Markley
Motors
9:30pm 3.3 / .3 9.6 / 2.4
85.9 / 17.1
Pedersen
Toyota
9:45pm 4.6**/ .4** 18.7** / 4.1**
74.7** / 14.7**
Proposed
Spradley-Barr
Ford
1.48/.1 7.9/A
64.4/31.9
* 2 of 5 lamps burned out on one pole where readings were taken.
** Luminaires in dire need of cleaning. LDD (luminaire dirt depreciation) could reduce light levels by as much as 35%.
SPRADLEY BARR ENGERY CONSERVATION
LIGHTING SYSTEM
CITY
TYPE
LAMP TYPE
30
SPOT
250 WATT METALHALIDE
64
AREA
1000 WATT METALHALIDE
60
AREA
1000 WATT METALHALIDE
21
AREA
1000 WATT METALHALIDE
SUNRISE 06:22 AM
SUNSET 07:38 PM
DATE 4-15-98
LIGHT SCHEDULE
PODS
FRONT ROW
LEVEL 1
MAIN LOT
LEVEL 2
MAIN LOT
LEVEL 3
SECURITY
HOURS PER DAY
10
8
D
6
O 4
MOUNTING AREA
GROUND
PODS
POLE
LEVELI
POLE
LEVEL2
POLE
LEVEL3
SuMoTuWeThFrSa
SuMoTuWeTh
FrSa
ON
OFF
OFF
07:38 PM
04:40 AM
04:40 AM
07:58 PM
10:00 PM
02:00 AM
08:18 PM
12:00 AM
02:00 AM
08:38 PM
06:12 AM
06:12 AM
70
60
50
40
30
20
10
0
WEEKDAYS
TOTAL
HOURS
KW
PER DAY
7.5
9.42
64
2.02
60
3.42
21
9.32
WATTAGE
urban design, inc.
Considering the review criteria as outlined in the Land Use Code, the following findings may
be made:
• The proposed alternative plan accomplishes the stated purposes of the Site Lighting Section,
"...to ensure that the functional and security needs of the project are met in a way that does
not adversely affect the adjacent properties or neighborhood." better than would a lighting
plan which strictly complies with the standards of that section. Because the nature of the use
requires that the products available for sale must be displayed outdoors this type of business
is more susceptible to vandalism than most others; and because customers must examine the
products in the outdoors, safety and visibility are more important than in a parking lot at
another business; the functional needs of the project cannot be met at a maximum lighting
level of ten (10) foot -candies. The proposed solution meets the functional needs of the
project in a way that does not adversely affect the adjacent properties or neighborhood. Not
only is there virtually no light spillage beyond the property lines, the average lighting level on
the site through the night will be substantially less than the ten foot-candles allowed by code.
Lighting levels are increased only during prime shopping hours to meet the functional needs
of the project, then reduced to achieve neighborhood compatibility and energy conservation.
• The proposed plan meets the Code's Design Standards, including using light sources that are
concealed or shielded to the extent feasible to minimize the potential for glare, and that
produce accurate color rendition superior to that produced by the typical mercury vapor or
high-pressure sodium lighting systems.
• The proposed plan meets the review criteria of Section 3.2.4(D)(2), as it:
o Does a superiorjob of protecting surrounding areas from light intrusion by providing
a sharply cut-off lighting level of near zero foot-candles at the site perimeter;
o Enhances neighborhood continuity and connectivity by providing appropriately lit
access to College Avenue and adjacent properties;
o Fosters non -vehicular access through the provision of a lighted pedestrian walkway
into the site; and
o Demonstrates innovative design and use of fixtures and other site elements as
described above.
We therefore request your approval of the lighting plan for Spradley Barr under the
Altemative Compliance provisions of the Fort Collins Land Use Code.
Sincerely,
el'do'n Ward, President
Cityscape Urban Design, Inc.
cc: Kriss Spradley, Spradley Barr
Bill Barr, Spradley Barr
Lucia Liley, March & Liley
Rod Bryant, Gregory Electric
April 23, 1998
Planning and Zoning Board
clo Steve Olt
Project Planner
City of Fort Collins
Planning Department
P.O. Box 580
Fort Collins, CO 80522
Dear Board Members;
co
urban design, inc.
3555 stanford road, suite 105
fort collins, colorado 80525
(970)226-4074
FAX (970) 226-4196
This letter is intended to provide more detailed information regarding the site lighting at the
Spradley-Barr Vehicle Display Area, and to request your approval of the proposed plan as an
alternative to a plan meeting a strict application of section 3.2.4(D)(7) of the Fort Collins Land Use
Code. That section of the code, calling for a maximum on -site lighting level of ten foot -candies, was
written to address common patron or employee parking areas. It did not recognize other functions
such as lighted athletic fields, product display, or outdoor performing arts facilities that cannot meet
the stated purpose of the Site Lighting section of the code, "...to ensure that the functional and
security needs of the project are met..." at a level of ten foot-candles. Those functions must be
considered under the Alternative Compliance provisions of the code.
Features of the Spradley Barr lighting system include:
❑ A lighting system designed around the curvilinear landscaped display area. Achieving a
controlled, even level of light for this plan, using poles limited to 28' or less in height, requires
a greater number of fixtures than are needed to light the typical straight display rows of
automobiles found at other dealerships.
❑ A state of the art, computer controlled lighting system that vastly decreases the affects on the
adjacent properties and neighborhood and results in substantial energy savings. The site is
fully illuminated only for a few prime shopping hours of each evening. Through the remainder
of the night (while other auto dealerships remain fully illuminated) the lighting levels at
Spradley Barr will drop to an average of less than 2 foot-candles; reducing the visual impacts
and reducing energy consumption to one third the level used at full illumination.
❑ Lighting levels that are below those of other dealerships. Recommended industry standards
for lighting the "front row" of cars at automobile dealerships are levels of 100 foot-candles or
more, with levels of over 300 foot-candles found at some Denver area dealerships. While
typical Fort Collins dealerships have front row light levels of 80 to 90 foot-candles, Spradley
Barr will have a maximum of 64.4. Spradley Barr lighting is designed to achieve less glare
and light levels beyond the property lines of virtually 0.
❑ Average lighting levels on the site at full illumination are 12.9 foot-candles (less than three
more than the typical parking lot standard in the code). Average lighting levels on the site at
non -prime shopping hours drop to 1.98 foot-candles.