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Helpful Hints
Types of Recessed Ceiling Light Fixtures
The most important step you can take to simplify the
installation of your LightSpeakers
®
is to know, before you
purchase, which type of ceiling light fixtures are installed
in your ceilings. The two most common recessed lighting
fixtures, and the ones that your LightSpeakers™ are
designed to best fit into, are the R30 and the R40 fixtures.
These designations are intended to let you know that these
recessed fixtures are suitable for use with either a 3” (R30)
light bulb or a 4” (R40) bulb. As you might expect, the R30
light fixture is smaller than the R40 and most importantly
the mounting systems are usually quite different. One way
to tell the difference between the two lighting fixtures is to
measure the diameter of the metal lighting fixture at the
point its rim exits the ceiling. An R30 can is very close to 5“
across and an R40 can is closer to 6“ across. The makers
of these fixtures do not adhere to a fixed standard so there
is some variation between the measurements of the various
manufacturers.
In the R30 lighting fixture the Edison connector is most
often attached to a “pigtail”; a short piece of electrical wiring
which allows the connector to hang loose in the can. In the
R40 lighting fixture the Edison connector is nearly always
attached to a “Socket Plate” which can be adjusted up or
down by loosening a wing nut on the side of the fixture.
The R40 lighting fixture nearly always has its Edison
connector firmly attached to a sliding plate which can
be moved up or down in the can by loosening a wing nut.
