are at their peak when your lighting installation is new. Most traditional
metal halide lamps decrease in light output to 40% of initial light
output by the end of rated life. A number of factors may accelerate
this reduction in efficacy (lumens per watt). Group relamping at
economic life keeps the light levels from dropping significantly.
It also provides an opportunity to remove dirt accumulation in the
luminaires. Cleaning during group relamping saves time and helps
maintain optimum light levels. A cleaner, well-lit environment increases
safety and security, can contribute to higher worker productivity
and creates a better impression on visitors.
of light changes over economic life, shifting 200K to 300K in color.
In the last 25% of rated life it may accelerate, shifting 500K to
600K. This causes old lamps to appear blue or pink especially when
compared to new lamps. All the lamps in an area will generally change
color together; so the color shift of the lamps will be most noticeable
during spot relamping.
the light output of traditional metal halide lamps decreases over
life, they still consume the same (or sometimes more) electricity.
Since energy is the largest cost of lighting, group relamping prevents
almost half of the energy from being wasted by under-performing
lamps. For example, a 400 watt traditional metal halide lamp may
consume $800 of electricity over rated life. After 60% of rated
life, about $320 is wasted on lamps providing less than mean lumens.
Spot relamping wastes energy dollars. The cost of a new lamp and
the labor to install it as part of group relamping is generally
less than 5% of the total energy cost.
4) Cost Effective
relamping, as a planned maintenance program, reduces downtime and
labor costs. Spot relamping often takes an employee away from regular
duties just to replace a burned out lamp. This inconvenience grows
as lamp failures increase towards the end of rated life. Group relamping
not only eliminates wasted labor and workday disruptions, it allows
for scheduling during normal shutdown periods.
at economic life is a practical way to reduce energy and maintenance
costs, as well as sustain workers visual acuity with a bright
workplace environment. It also offers the opportunity to replace
older lighting with Ventures energy saving Energy Master®
retrofit products or new, more efficient Uni-Form pulse start systems.