A laboratory supply and distribution company hired GreenTech Energy Services to upgrade the lighting in one of its East Coast warehouses. Inside, fixtures with T12 fluorescent lamps were retrofit with T8s; outside, high pressure sodium and metal halide floods, wall packs and shoeboxes were replaced by new LED fixtures. Eliminating the obsolete equipment significantly reduced maintenance costs, but utility bills before and after the retrofit proved energy savings as well. The graphs below compare kWh consumption before and after the retrofit.
| kWh Usage | ||
| 2012 | 2013 | |
| July | 315,120 | 325,600 |
| August | 316,400 | 275,361 |
| September | 282,640 | 230,976 |
| December | 224,960 | 216,000 |