ITEM 6.1 Water Tower lightingots111.17
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MINNESOTA g
DEPARTMENT INFORMATION
Request for
City Council Action
ORIGINATING DEPARTMENT:
REQUESTOR:
MEETING DATE:
Utilities
Kurt Neidermeier, Utility
June 22nd, 2015
Manager
PRESENTER(s):
REVIEWED BY:
ITEM #:
Kurt Neidermeier, Utility
Lori Johnson, City Administrator
6.1 Water Tower Lighting
Manager
AGENDA ITEM DETAILS
RECOMMENDATION:
The West Public Water System Water Tower Logo Lights were reviewed for a lighting retrofit at the May
Public Works Subcommittee and recommended for Council review. Staff recommends the lights be
retrofit with ceramic metal halide fixtures and request direction for hours of operations.
ARE YOU SEEKING APPROVAL OF A CONTRACT?
No.
IS A PUBLIC HEARING REQUIRED?
No.
BACKGROUND/JUSTIFICATION:
A lighting review was conducted to increase visual display of the Otsego logo on the West Water Tower.
The following is a synopsis of the findings.
The West Water Tower located near Interstate 94 uses 240 volt, 400 watt Metal Halide bulbs on four 25
foot poles; in comparison the East Water Tower located near Highway 101 uses 240 volt, 1000 watt
Metal Halide bulbs on four 35 foot poles.
Several options were proposed from two electrical contractors; both indicating pole repositioning would
provide the most accurate direct light. A budget estimate for the proposal was $4,000 to $5,000 per
pole.
Three lighting options were reviewed to retrofit existing fixtures with Ceramic Metal Halide and LED's.
Option 1: Ceramic Metal Halide Fixture 1000W equivalent
This option includes replacement of the existing 40OW metal halide (MH) fixtures with ceramic
MH fixtures equivalent to 1000 Watt brightness. The efficiency of ceramic fixtures over its
counterpart is approximately double the lumen rating per watt of power at this size; more light
requiring less power.
Benefits of the ceramic fixture include a high color temp rating, providing a brighter light; a lamp
that retains its near original lumen output, (95% vs 60% in 10,000 hours) meaning the lamp
remains brighter through the life of the bulb; a lamp rated at 5 times the life expectancy and
reduction of power consumption.
This retrofit providing ceramic fixtures on all four poles was quoted at $2400.00. A rebate is also
available from Wright Hennepin Electric for $75.00 per fixture replacement or total rebate of
$300 for the four lamps. Payback for the retrofit is approximately 4 years due to the reduction
in wattage required by the system.
Options 2 and 3 provide LED replacement fixtures. Benefits of LED include a lamp containing no
mercury, unmatched reduction in electrical consumption and longevity.
Option 2: LED Fixture 1000W equivalent
This option replaces the existing metal halide fixtures with LED fixtures using four LED
floodlights sized to replace 1000W MH. Project estimated at $6600.00.
Energy reduction is noted with this option however the payback is over 10 years as the price of
LED's remain high.
Option 3: LED Fixture 400W equivalent
This option replaces the existing metal halide fixtures with LED fixtures using four LED
floodlights sized to replace existing 400W MH. The project is estimated at $4525.00 and is
available for a $480 rebate. A substantial reduction in energy is noted with this option and
payback approximately 4 years; however the concerns are lighting would not provide the effect
the City is requesting.
The Ceramic Metal Halide Retrofit provides the most cost effective lighting option with return on
investment. Staff feels the increased light to the logo on the West Water Tower would have minimal
impact to the adjacent properties however should be considered as the intensity and reflective light is
increased. A trial of two lamps could be conducted to further compare effectiveness. Financing of the
project would be supported by the water operating fund.
Hours of Lighting:
Tower logo lights are on each evening throughout the night controlled by use of light sensing photo
eyes. A clock timer is available to provide additional off control for energy and cost savings during low
travel periods of adjacent roadways if Council desires. Electrical work to incorporate the timer is
estimated at $300. Included is calculated energy and cost savings for the four logo lights turned off for
one hour for one year. Staff requests Council direction for standard practice of hours of operation for
logo lighting.
Calculated energy and cost savings per year for each hour lights are off:
West Water Tower
Wattage --- Hours --- # Lights---Wattage/year---kWh---Cost per KWh---Savings per year
454 365 4 662840 662.8 $0.115 $76.22
315 365 4 459900 459.9 $0.115 $52.89
East Water Tower
Wattage --- Hours---# Lights---Wattage/year---kWh---Cost per KWh---Savings per year
1000 365 4 1460000 1460 $0.115 $168
SUPPORTING DOCUMENTS: ATTACHED X NONE
POSSIBLE MOTION
Please word motion as you would like it to appear in the minutes.
Motion to retrofit the West Public Water System Water Tower with Ceramic Metal Halide fixtures.
BUDGET INFORMATION
FUNDING: BUDGETED: ❑ YES
601— Water Operations Budget
x NO
ACTION TAKEN
❑ APPROVED AS REQUESTED ❑ DENIED ❑ TABLED ❑ OTHER (List changes)
COMMENTS: