Cooper Lighting ADH080747 Design Manual page 7

Lamp Type Lamp Orientation
1000W Probe Start MH Vertical
Horizontal
1000W Pulse Start MH Vertical
Horizontal
875W Pulse Start MH Vertical
Horizontal
750W Pulse Start MH Vertical
Horizontal
Average Input
Lamp Type Watts
1000W Probe Start MH 1080
875W Pulse Start MH 940
750W Pulse Start MH 820
NOTES: 1 A medium sized automotive dealership typically has 150 fixtures on site. If your dealership varies from this size, savings can be calculated using the following multiplier: 0.67 [100 fixtures], 1.33 [200
fixtures], 1.67 [250 fixtures]. 2 Total annual cost is the cost of operating 150 fixtures 10 hours per day with a national average energy cost of $0.10 per KWH. Annual Cost = (Input watts)*(# of
fixtures)*(operating hours)*(days/year)*(KWH/1000). 3 Annual Savings is the money saved by operating 150 fixtures for 10 hours per day with the listed pulse start lamp over the standard 1000W probe
start lamp. Annual Savings = (Total Annual 1000W Probe Start MH cost) - (Total Annual Cost Pulse Start MH).
Beyond efficient light source selection, close-of-business site light dimming offers the next level of energy savings opportunities. On average, site
lighting installations operate for approximately 10 hours each evening. During this time, only 4-6 hours are during actual business hours. Through
close-of-business dimming protocol an average sized dealership could reduce operating expenses related to lighting system energy consumption in
excess of 38%. Cooper Lighting's Hi-Low dimming option enables increased energy savings through an internally integrated dimming relay that
reduces power while closely maintaining site lighting uniformity levels that ensure safety and inventory protection throughout the site.
Lamp Type
1000W Probe Start MH [Full Power]
1000W Probe Start MH [Hi-Low Dimming] 665
875W Pulse Start MH [Full Power]
875w Pulse Start MH [Hi-Low Dimming]
750W Pulse Start MH [Full Power]
750W Pulse Start MH [Hi-Low Dimming]
NOTES: 1 A medium sized automotive dealership typically has 150 fixtures on site. If your dealership varies from this size, savings can be calculated using the following multiplier: 0.67 [100 fixtures], 1.33 [200
fixtures], 1.67 [250 fixtures]. 2 Total annual cost is the cost of operating 150 fixtures 5 hours per day with a national average energy cost of $0.10 per KWH. Annual Cost = (Input watts)*(# of
fixtures)*(operating hours)*(days/year)*(KWH/1000). 3 Annual Savings is the money saved by operating 150 fixtures in dimmed operation for 5 hours per day. Annual Savings = (Total Annual [Full Power]
Cost) - (Total Annual [Hi-Low Dimming] Cost).
Alternating Fixture Switching
Hi-Low Dimming
Maintained Lumens Life [hrs.]
82,000 10,000
71,500 9,000
96,000 15,000
86,000 9,000
80,000 20,000
76,000 12,000
62,000 16,000
47,500 12,000
Number of Operating Days/
Fixtures 1 Hours/Day Year
150 10 365
150 10 365
150 10 365
Off Business
Average Input Number of Operating
Watts Fixtures 1 Hours/Day
1080 150 5
150 5
940 150 5
575 150 5
820 150 5
498 150 5
Input Watts Efficacy [lms/w]
1080 102
1080 97
1100 109
1100 98
940 106
940 101
820 100
820 83
Total Annual
$/KWH Operating Cost
0.10 $59,130
0.10 $51,465
0.10 $44,895
Days/ Total Annual
Year $/KWH Operating Cost
365 0.10 $29,565
365 0.10 $18,204
365 0.10 $25,733
365 0.10 $15,741
365 0.10 $22,448
365 0.10 $13,633
Annual
2 Savings 3 % Savings
$7,665 13%
$14,235 24%
Dimming
Annual
2 Savings 3 % Savings
$11,361 38%
$9,992 39%
$8,815 39%