In companies and municipalities, maintenance
schedules specify when light sources
and control systems need to be maintained.
Maintenance is influenced by the degree
of protection of the luminaire, operating
conditions and other factors. For repairs, it
is an advantage if defective parts are easy
to replace. Environmentally friendly products
can be almost wholly recycled after
use. In the case of LED and fluorescent
lamps, more than 90 percent of the material
used is recyclable; recoverable materials
nclude glass, metals, phosphor powders
and mercury.