| MANUFACTURING: Retrofit Application |
EXISTING SYSTEM
400W prismatic high-bay fixtures w/standard metal halide |
PROPOSED
320W pulse-start prismatic high-bay fixtures |
| LAYOUT |
Fixture Mounting Height |
31 ft. |
31 ft. |
| LAMP & FIXTURE DATA |
Initial lamp lumens |
34000 (new lamp) |
36100 |
| Number of lamps |
1 |
1 |
| Initial fixture lumens |
34000 |
36100 |
| Ballast factor |
1.00 |
1.00 |
| Initial fixture lumens (ballast corrected) |
34000 |
36100 |
| Lamp lumen depreciation |
0.75 |
0.86 |
| Luminaire dirt depreciation |
0.88 |
0.88 |
| Fixture efficiency (%) |
77.8 |
89.2 |
| Maintained fixture lumens |
17458 |
24370 |
| Fixture watts |
460 |
345 |
| Fixture lumens/watt |
38 |
70 |
| FOOTCANDLES |
CRI |
70 |
70 |
| FC Average Maintained |
71 |
69 |
| OPERATING DATA |
Number of fixtures |
990 |
820 |
| Cost/kWh |
$0.085 |
$0.085 |
| Total wattage |
455400 |
282900 |
| Square footage |
245000 |
245000 |
| Total installed price |
Existing |
$241,900 |
| Watts/square foot |
1.86 |
1.15 |
| Annual operating hours |
8760 |
8760 |
| SAVINGS ANALYSIS |
Annual Energy Costs |
$339,090 |
$210,647 |
| Annual Energy Savings |
Existing |
$128,443 |
| COMMERCIAL BUILDINGS DEDUCTION |
Lighted area (square feet) |
N/A |
245000 |
| ASHRAE/IES Standard 90.1-2001 requirement (watts/square foot) |
2.2 |
| LPD below Standard 90.1-2001 |
48% |
| Eligible deduction per square foot |
$0.60 |
| Max. Commercial Buildings Deduction (final benefit depends on owner’s tax rate) |
$147,000 |
| CONTROLS |
Mandatory controls (see Standard 90.1-2001) and mandatory bi-level switching (see Commercial Buildings Deduction) can increase energy savings. |
