138 Common Retrofits

Although there are numerous potential combinations of lamps, ballasts and lighting systems, a few retrofits are very common.

Offices

In office applications, popular and profitable retrofits involve installing electronic ballasts and energy efficient lamps, and in some cases, reflectors. Table 13.20 shows how a typical system changes with the addition of reflectors and the removal or substitution of lamps and ballasts. Notice that thin lamps allow more light to exit the fixture, thereby increasing fixture efficiency. Reflectors improve efficiency by greater amounts when there are less lamps (or thinner lamps) to block exiting light beams.

The expression (Lumens)/(Fixture watt) is an indicator of the overall efficiency of the lighting system. It is similar to the efficacy of a lamp.

Indoor/Outdoor Industrial

In nearly all applications with significant annual operating hours, mercury vapor systems can be replaced by metal halide (or high output fluorescent systems). This retrofit will improve CRI, reduce operating and relamp-ing costs. In applications where CRI is not critical, HPS systems (which have a higher efficacy than metal halide systems) can be used.

Almost Anywhere

In nearly all applications where incandescent lamps are ON for more than 5 hours per day, switching to CFLs will be cost-effective.

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