KKK-A-1822 E
lights shall be mounted as close as possible to the front upper edge of each front fender and may
be angled forward a maximum of 30 degrees. All warning lights furnished shall be mounted to
project their highest intensity beams on the horizontal plane, (see 3.8.2.4).
3.8.2.2 PHOTOMETRIC, CHROMATICITY, AND PHYSICAL REQUIREMENTS.
Each emergency light shall flash 75 to 125 times per minute. The chromaticity values of the lights
shall conform to SAE J578, for their respective color, except for the red lights, which in addition
may conform to the following expanded boundary limits of: y =0.34; y = 0.32; x = 0.62. All
warning lights shall project a beam spread of at least 5 degrees up and 5 degrees down and at
least 45 degrees left and right of H-V. Each light shall produce flash energy, (Cd-s) per flash,
measured from the H-V to all the extreme test point coordinates and shall be tested at all 5o
increments. At no point shall the Cd-s values drop to less than the minimum values as shown in
the table above when tested at 14.2 volts. Flash energy shall be determined in accordance with
the SAE J845 method for determining the flash energy of a light. Testing shall be conducted on
the device(s) as manufactured including use of the actual light source and all other related system
components.
3.8.2.3 SWITCHING ARRANGEMENTS.
The emergency light switches shall be wired and arranged to provide the warning light signal
modes and combinations as specified. All emergency light switches shall be labeled (see 3.7.11)
and each Primary/Secondary mode switch shall have an amber or red indicator light to show the
driver which mode is activated. When strobe lights are furnished or, when specified (see 6.2-v)
for incandescent lights, a day-night switch shall be provided. When specified (see 6.2-v) from
the lighting system manufacturer, an automatic switch to the "Secondary Mode" when the gear
selector is placed in the "Park/ Neutral" position, with a manual override to the "Primary Mode"
shall be furnished. Additionally, when specified (see 6.2-v) from the lighting system manufacturer,
the lighting system shall provide an ambient light sensing circuit to automatically switch to the
"Night" position while in the "Secondary Mode". A manual override to the daytime (bright)
mode shall be provided. Operators manual (3.20) shall include suggestive management instructions
for the warning systems.
3.8.2.4 HARDWARE CONSTRUCTION AND INSTALLATION.
The emergency lighting system shall be comprised of components and devices that comply to the
general requirements and tests of SAE J575g, J576d, J578, and J551, as applicable for the unit.
Warning lights shall be firmly fastened to reinforced body surfaces in accordance with the lighting
manufacturer's requirements and recommendations and include aiming wedges to compensate
for sloped body surfaces, grill, hood and fender angles or mold release angles on roof caps. The
ambulance manufacturer shall aim the lights to assure that all lighting performance requirements
herein are met. The lights shall be aimed either mechanically or optically on the horizontal axis
with a tolerance of +0 degrees to -3 degrees. All switches, connectors, and wiring shall be rated
to carry a minimum of 125 percent of their maximum ampere load. When halogen or other long
duty cycle light source is used, the duty cycle of any device shall not exceed 50 percent. When
strobe lights are furnished, all high voltage leads and connections shall be insulated and enclosed,
or weather proof connectors, with the proper voltage rating shall be used.
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