UFC 3 -520-01
June 10, 2002
capabilities, and lower harmonic distortion ballasts might be required for specific
applications. Consider ballast end -o f-life sensing circuitry for the application.
F-6.3.4 Lamps with medium bases indicate that the ballast is self-contained. If used,
these lamps should be of the type that permits lamp replacement without ballast
disposal. Applications of this technology should be limited to energy efficiency
conversions of existing facilities, including table lamps, floor lamps, and other portable
lighting.
F-6.4
Mercury Vapor Lamps.
F-6.4.1 Mercury vapor lamps are a type of high intensity discharge lamp whose most
common applications include roadway lighting, flood lighting, and other forms of outdoor
and industrial lighting.
F-6.4.2 Because mercury vapor lamps are i nefficient compared to metal halide and
high-pressure sodium lamps, their use in new designs should be avoided. In existing
installations, consider retrofitting with sources that are more efficient.
F-6.5
Metal Halide Lamps.
F-6.5.1 Metal halide lamps a re a type of high intensity discharge lamp whose most
common applications include roadway lighting, flood lighting, and other forms of outdoor
and industrial lighting. In addition, low wattage (150 watts and less) versions are used
for a wide variety of i ndoor and exterior applications.
F-6.5.2 Lighting systems employing metal halide lamps should be considered
acceptable choices in the majority of interior applications. Wherever possible, designs
should utilize pulse -start lamps with a minimum CRI of 65. Lamp color options are
limited and specific lamp color should be determined in accordance with paragraphs
F-4.2 through F -4.3. Secondary preference should be given to standard metal halide
lamps in 175-, 250-, 400-, and 1000-watt sizes. Lamp warm -up and restrike times
should be taken into consideration, and appropriate instant-starting emergency lights
should be provided. Metal halide lamps should be the pulse -start type because of
improved life and higher lumen output capability.
F-6.5.3 Newer ceramic metal halide lamps offer improved color resolution (up to 85
CRI) and reduced color shift, and are appropriate light sources in many interior
applications.
F-6.5.4 Because of rapidly changing technology in metal halide lamps, specific
designs should consider employing evolving technology designed to increase lamp life
or increase energy efficiency. Electronic ballasts can be considered, particularly in
ballasts for lamps 100 watts and less, provided adequate warranty coverage is included.
F-10
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