All of the indoor LED retrofits were 1:1 replacements for existing bulbs

As with the outdoor area, all of the indoor LED retrofits were 1:1 replacements for existing bulbs. But when it comes to the bottom line, Young stated "The unspoken thing we are very excited about is the maintenance and labor savings." He described how scaffolding had to be constructed once a year from the basement level to the second floor to replace the twelve 90W bulbs in the atrium area (Fig. 3), a task that was performed on the weekends. The company replaced the bulbs with 20W LED PAR38 lamps that are rated for 50,000 hours, which could allow the company to avoid the use of scaffolding for up to seven years.The GL350's performance is poor even by OLED standards.Veit explained that the calculation of maintenance savings was a combined effort between Marriott and GE Lighting personnel. "They were able to look at invoices from their contractors to calculate the yearly spend in day to day maintenance and the yearly cost associated with replacing ballasts or lamps when they went bad," he said. "Then we all agreed on what percentage would be saved with the new LED lighting system, because no system requires zero maintenance."
The headquarters has eight floors, which is lined with hallways containing artwork lit by halogen track lighting. GE replaced approximately 1000 65W incandescent bulbs with 7W LED PAR20 lamps in all hallways (Fig. 4). The 58W difference will deliver a nearly $18,000 savings (150,000-kWh) in electricity expense over 261 working days. Veit described the challenge of providing improved lighting in the Marriott auditorium, which has a 12-foot ceiling and had used a combination of halogen lamps, CFL lighting and a dimming system. "The auditorium had insufficient light levels for their needs and they were reluctant to implement traditional LED lighting because of concern over glare with the relatively low ceiling height," said Veit. In addition, while the halogen lights could be dimmed, the CFLs could not. The lighting retrofit was able to utilize the existing dimming system while installing 140 GE 12W LED BR30 lamps with plastic shrouds that control glare. The auditorium now has higher light levels, is fully dimmable and saves $2300 annually in energy cost. In the building's lower level, a combination of 4×4-ft and 1×4-ft fluorescent fixtures were replaced with 72 GE Lumination 2×2-ft recessed LED troffers. When illuminated, the fixtures produce even illumination. While off, they appear free of a light source and provide a soft glow. The replacement produced a dimmable, more elegant and uniform look in the company's lunchroom and day-care area.