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|  MIL-L-27160 (USAF)
3.3.2.2.1 Dielectric. The lamp circuit shall withstand 500V plus twice the lamp circuit
design voltage at 60 Hz for one minute under the conditions specified in 4.5.7.
3.3.3 Life and reliability. The lighting system shall be designed for a life of 1,000 hours or
for the period required by the applicable instrument specification, whichever is greater.
Reliability shall be in accordance with the applicable detail specification.
3.3.4 Color. The color of the white portions of the indicator display with 4.50 0.050V
applied to the lighting terminals shall be x = 0.440 0.020 and y = 0.405 0.020 when
measured as specified herein.
3.3.5 Brightness. When 4.50 0.050V are applied to the lighting terminals, the light
intensity and distribution shall be as follows:
1.00 0.50 foot-lambert. The average of all readings taken in the
a. White areas:
white areas shall be 1.00 0.30 foot-lamberts.
0.60 0.30 foot-lambert.
b. Gray area:
0.05 0.03 foot-lambert when reflected light (wedge and ring
c. Black areas:
lighting) is used and 0.04 0.02 foot-lambert for refracted light
(back lighting).
d. Pointers, lubber lines, command bars, miniature airplane symbols deviation bars, and
other similar reference marks:
1.20 0.50 foot-lambert. The average brightness of all of the
(pointer) readings shall be 0.10 to 0.50 foot-lamberts higher than
the average brightness of the (dial) white areas.
1.00 0.50 foot-lambert.
e. Red areas:
The brightness of other colors and the selection of colors shall be governed by their
relative brightness in daylight and shall be subject to the approval of the procuring activity.
When no other guidance is available, the brightness of these other colored areas shall be
1.0 0.50 foot-lambert.
3.3.6 Stray light. The lighting system shall be so housed as to prevent the leakage of
stray light and to shield all lamp filaments from direct view.
3.3.7 Light leakage. The lighting system shall in no way restrict the visibility of any
graduations, numerals, pointers, or other specific markings.
3
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