Lighting. Page: 7 of 17
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200 150 100
0 4,000 8,000 12,000 16,000
NO. OF HOU RS
' Dotted portion indicates the reduction in outpul due to ballast
' Range , bulb life depends on number of starts voltage and ballast condition
Figure 3: A conpurison of bulb li/> and light output for various types ojflighting.
tubes: 32-watt tubes provide the same light output as
the older 40-watt tubes. When replacing tubes, also
replace existing ballasts with the new high-efficiency
type. 'They save 25 percent over existing ballasts and
will last longer.
Replacing Incandescent Bulbs with
Fluorescent Adapter Units
Fluorescent adapter units are now available for use in
incandescent fixtures. Fluorescent adapters require no
rewiring (Figure 5). The adapter normally comes with a
ballast, starter and bulb and is available in both screw-
in and side-plug models. The fluorescent bulbs have a
life of 12.000 to 20,000 hours compared to the 750
hours of an incandescent bulb. and they provide three
to four times more lumens per watt than incandescent
bulbs. The adapter units work well in recessed and
semi-recessed fixtures. Remember to check the fixture
size before purchasing the unit to make sure it will fit.
Your savings depend on the number of hours per year
the fixture is used. For example, a 22-watt fluorescent
adapter costs about $25. Using it to replace a 75-watt
incandescent bulb operating 2000 hours per year at five
cents per kWh would result in the following savings:
$0.05 x (75W - 22W) x 2000 hr 30/yr.
kWh 1000 watts/ kW
Circular Fluorescent Incandescent P-1 Fluorescent
(61 Dia) 15Watt 60 Watt 13Watt (9')
(8."DDIa) 22WatI 75WatlI 18Watt(11)
(12' DIa) 32Watt = 100 Watt 27Watt (11")
Figure 5: A guide for replacing incandescent
bulbs with rompurabletltunrescents.
LIGHTOUTPUT LIGHTINGTYPE BULB LIFETIME
* MIN MAX*
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Administration., United States. Bonneville Power. Lighting., report, September 1, 1992; Portland, Oregon. (https://digital.library.unt.edu/ark:/67531/metadc1317287/m1/7/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.