LED Lighting Maintenance

Examples on lamp lifetime calculation:
- Working hours: 18 hours a day; and 54 working weeks a year, which is equivalent to 6,800 hours per year.
- Room is to be renewed after 15 years is equivalent to 102,000 hours in total
- Room are dirty
- Lighting system: 4 ft led tube closed luminaires (IP40)
- LED light sources
- The maintenance factor MF is 0.6; means that the new lighting system is required to be overdriven by 67% not to undercut the minimum required illumination level after 10 years.