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TitleLighting Retrofit Manual
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Page 1

Lighting Retrofit Manual

Technical Report

Page 125

Retrofit Technologies


This will probably be more often than before, because the room is no longer

Group relamping is another technique that will help maintain the desired light output
from a reflectorized luminaire because group relamping ensures that fresh (non-
depreciated) lamps are more often in place.

When to Use Reflectors

If you are not changing lamps/ballasts, locate spaces in your building that are
overlighted and can tolerate operating at 60–75% of current illuminance. You can
determine the existing lighting level using either the lumen method of calculation, or
by measurements in a typical space that is cleaned and relamped. If your retrofit
includes replacing lamps/ballasts, then you should consider reflectors even in spaces
that are not overlighted, as you can choose a lamp/ballast combination that will
provide equal or better illumination from the delamped luminaire.


Retrofits are sufficiently common that reflector manufacturers have standardized the
most popular products into “kits.” Kits are generally well-developed products that
reduce installation time and cost and combine reflectors or other retrofit technologies
with the most often required components to make the retrofit complete.

Take for example the most common retrofit: delamping a 2’x 4’ lens troffer to two
lamps, using a combination of a reflector to increase luminaire efficiency and T-8 lamps
and electronic ballasts to produce a much lower-wattage fixture and acceptable lighting
levels. This retrofit involves these actual steps:

1. Remove lens and set aside to be cleaned and reinstalled (or replaced).

2. Strip out all fixture “guts,” including lamp sockets, socket wires, socket mounting
brackets (“bridges”), and ballast.

3. Install new ballast and connect to power source.

4. Install new socket bridges, sockets, and wiring.

5. Connect socket wires to ballast.

6. Install reflector.

7. Install new lamps.

8. Clean and reinstall lens.

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Retrofit Technologies


A well designed “kit” usually includes some combination of reflector, socket bridge(s),
prewired sockets, and ballast, designed to install quickly into a gutted luminaire,
combining most of steps 3, 4, 5, and 6. The technician positions the “kit,” fastens it in
position with self drilling “tek” screws, lowers the hinged access, connects power to the
ballast, raises the hinged portion back in place, and installs the lens. Labor savings
significantly outweighs the additional cost of the kit.

Figure 3-11 Typical Retrofit Kit for 2x4 Troffer

Kits can also be made of retrofits not involving reflectors. One such common kit is
designed for replacing two 8-foot F96T12 slimline lamps with four 4-foot lamps and an
electronic ballast. This kit is often used for industrial and commercial strip lights,
resulting in reduced power, longer lamp life, and lower lamp cost. In some kits the
ballast compartment cover is hinged to allow quicker installation by one person.

Even though there are thousands of different fixture designs that are candidates for
retrofitting, most of these fixture types have been retrofitted before and the retrofit and
reflector companies have developed patterns for them. Now, the features of a kit are
readily made into a product designed specifically for the luminaire being retrofitted.

Page 250

Lighting Education and Laboratory Facilities


Luminaire Manufacturer Centers

Cooper Lighting
400 Busse Raod
Elk Grove Village, IL 60007
(708) 956-8400

A 14,000 ft2 complex with multiple rooms and displays
featuring company products. Classes of varying lengths
include general education and classes in LUXICON.

Lithonia Lighting
Lithonia Lighting Center
PO Box A
Conyers, GA 30207
(770) 922-9000

A 20,000 ft2 complex with multiple rooms and displays
featuring company products. Classes of varying lengths
include general education and classes in VISUAL.

Canlyte Inc.
Lighting Concept Center
160 Pears Ave.
Toronto, ONT CA M5R 1T2
(416) 960-1400

Demonstration and resource facility. Classes of varying
lengths include general education and classes in GENESYS.

Prescolite Specification Center
1251 Doolittle Dr.
San Leandro, CA 94577
(510) 562-3500

Demonstration and resource facility. Classes of varying
lengths include general education and classes in LITEPRO.

Other manufacturer have facilities. If in question, ask the manufacturer in whose products you
have interest.

Page 251

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