| WAREHOUSE: Retrofit Application |
EXISTING SYSTEM
400W high-bay standard metal halide |
PROPOSED
Fluorescent high-bay w/6-lamp high-lumen T8 lamps |
| LAYOUT |
Fixture Mounting Height |
31 ft. |
31 ft. |
| LAMP & FIXTURE DATA |
Initial lamp lumens |
36000 |
3100 |
| Number of lamps |
1 |
6 |
| Initial fixture lumens |
36000 |
18600 |
| Ballast factor |
1.00 |
1.18 |
| Initial fixture lumens (ballast corrected) |
36000 |
21948 |
| Lamp lumen depreciation |
0.75 |
0.95 |
| Luminaire dirt depreciation |
0.88 |
0.88 |
| Fixture efficiency (%) |
79.2 |
0.937 |
| Maintained fixture lumens |
18818 |
17193 |
| Fixture watts |
460 |
222 |
| Fixture lumens/watt |
41 |
77 |
| FOOTCANDLES |
CRI |
65 |
82 |
| FC Average Maintained |
38 |
34 |
| OPERATING DATA |
Number of fixtures |
496 |
496 |
| Cost/kWh |
$0.085 |
$0.085 |
| Total wattage |
228160 |
110112 |
| Square footage |
245000 |
245000 |
| Total installed price |
Existing |
$105,000 |
| Watts/square foot |
0.93 |
0.45 |
| Annual operating hours |
8760 |
8760 |
| SAVINGS ANALYSIS |
Annual Energy Costs |
$169,888 |
$81,989 |
| Annual Energy Savings |
Existing |
$87,899 |
| COMMERCIAL BUILDINGS DEDUCTION |
Lighted area (square feet) |
N/A |
245000 |
| ASHRAE/IES Standard 90.1-2001 requirement (watts/square foot) |
1.2 |
| LPD below Standard 90.1-2001 |
63% |
| Eligible deduction per square foot |
$0.60 |
| Max. Commercial Buildings Deduction (final benefit depends on owner’s tax rate) |
$105,000 (project cost; $147,000 was the max. allowed) |
| CONTROLS |
Mandatory controls (see Standard 90.1-2001) and mandatory bi-level switching (see Commercial Buildings Deduction) can increase energy savings. |
