Section 3: Group Relamping
Background
Group relamping involves the replacement of all lamps in an
illumination system on a regular schedule. This period is known
as the group relamping interval. Group relamping should be considered
in the maintenance of existing non-LED illumination systems so as
to better utilize TxDOT resources.
Advantages
Group relamping improves the illuminance level while possibly
reducing the costs involved in operating the system. Several important
elements determine the cost of maintaining an illumination system,
including the cost of labor, equipment, and traffic control. Increased
costs require TxDOT employees to seek innovative and less expensive
ways to perform maintenance functions. Group relamping is an attractive
alternative to spot replacement of lamps, because the costs for
labor, traffic control, and equipment use are greatly reduced. Group
relamping also lends itself well to contracting.
Strategy
Group relamping should be scheduled every three to five years. Group relamping should be planned in advance of the need for lamp replacement. Adequate traffic control, in accordance with the (TMUTCD), should be provided to assist motorists around the work zone and to provide added safety for maintenance crews. Other maintenance functions such as ballast replacement, igniter (starter) replacement, or fixture replacement and cleaning should be accomplished during group relamping.
Prior to performing group relamping activities on a three to five year interval, a cost analysis should be performed to determine if LED luminaire head replacements may be more feasible. Considering the fact that LED luminaires are becoming more economically priced, last longer, and are cheaper to operate, it may be more feasible to replace the conventional heads with LED heads rather than relamping with conventional bulbs.
Cleaning Luminaires
Cleaning of the luminaires, which involves wiping the dirt
from reflectors and refractors, should be performed during group
relamping. This periodic cleaning of the fixtures reduces the depreciation of
light due to the accumulation of dirt and allows the delivery of
more light per lighting dollar. Allowing the illumination system
to provide more consistent illuminance throughout the life of the lamps
provides the motorist with better visibility and TxDOT with a more
cost efficient lighting system.