Group Relamping

The concept of group relamping involves the systematic replacement of lamps at pre-determined intervals. Instead of replacing lamps as they burn out (spot relamping), substantial labor savings can be achieved by implementing a group relamping strategy.

Newer Technology

Newer technology, reduced wattage T-8 lamps have the added benefit of energy savings over the standard efficiency T-8 lamps by 2 to 4 watts per lamp. Since it is possible to predict when a typical fluorescent lamp will burn out, the optimal time to replace the lamps will be just before that time is reached. As fluorescent age, their light output decreases, yet they consume the same amount of energy producing lower light levels. Timely replacement of old lamps eliminates this inefficiency.

The Benefits

Aside from the economic benefits, other tangible benefits are possible by implementing a group relamping strategy. For example, scheduling a relamping program during off peak hours eliminates disruption to employees and tenants, thereby increasing productivity. Light levels are also adequately maintained because lamps are replaced before their light output has fully depreciated and color shift over lamp life is virtually eliminated. Furthermore, lamps can be ordered in advance and purchased in bulk for additional volume discounts. And finally, fewer lamps are needed for inventory purposes, freeing up storage space.

When To Relamp

So when is the optimal interval to group relamp? The answer is the point when the lamps in an area will start burning out on a regular basis. This makes it cost effective to just replace them all even if they aren’t burned out yet. Therefore, the optimal time for group relamping usually works out to 70% to 80% of rated lamp life. The chart bellows indicates typical mortality curves for fluorescent lamps.

Group relamping also allows for the implementation other lighting strategies such as replacement and/or repair of defective components such as ballasts and sockets. Additionally, fixture cleaning can be accomplished during relamping. This is important because fixtures can lose as much as 30% of their light output through the build up of dust, grease and other dirt accumulations. Finally, group relamping offers an opportunity to reevaluate your lighting needs and allow for replacement with higher efficiency lamps or alternate color temperatures.