MIL-STD-1179 Lamps, Reflectors And Associated Signaling Equipment For Military VehiclesThis standard applies to all military combat, special purpose and tactical transport vehicles, both tracked and wheeled. Administrative and commercial vehicles are not within the scope of this standard, since total compliance with Motor Vehicle Safety Standard MVSS No. 108 is required for these vehicles. Infrared secure lighting photometric requirements apply to new military vehicles starting with serial number 1 manufactured after September 1, 1988. Retrofit, rebuild, or other modifications of military vehicles built before September 1, 1988 will conform to Secure Lighting Requirements upon determination of need and discretionary judgment by the appropriate modifying Government agent.

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MIL-STD-1179E

4.5.3 Secure blackout driving lamp. The secure blackout driving lamp, at a design voltage of 28.0 volts (V) direct current (dc), shall emit a blue-green light.

4.5.4 Secure blackout taillamp. The secure blackout taillamp shall meet the requirements specified in 4.5.4.1 through 4.5.4.5.

4.5.4.1 Visibility of beams. The secure blackout taillamp filter lens shall be opaque except for four Y-shaped openings which shall emit red-orange light. The four openings of each secure blackout taillamp shall be individually visible up to 60 feet. From 60 to 120 feet, the openings shall appear as two points of light.

4.5.4.2 Visibility from air.

a. Vehicle on 20 percent downgrade. When vehicle is on a 20 percent downgrade, the vertical angles of cutoff above the horizontal shall be the maximum practicable, provided the single light effect of the secure blackout taillamp shall not be visible from the air at more than 400 feet above a horizontal line extended through the secure blackout taillamp.

b. Vehicle on level road. When vehicle is on a level road the vertical angles of cutoff of the blackout taillamp below the horizontal shall be such as not to cast a reflection on the road that would be visible from the air at a height of not more than 40 feet.

4.5.4.3 Horizontal visibility on road. When the vehicle is on a level road, the horizontal angles of cutoff shall be the maximum practicable but shall be not less than 60 degrees right or left of the beam centerline at 100 feet.

4.5.4.4 Color of visible light. Color values of the transmitted visible light shall be in accordance with trichromatic coefficients specified in component drawings.

4.5.4.5 Secure blackout lighting. Secure blackout lighting is the restriction of blackout mode light sources spectral emissions. Light sources that can or do emit light during blackout mode of operation shall be restricted to the visible portion of the electromagnetic spectrum between 380 and 700 nanometers. Peak emission in the infrared 700 to 1200 nanometer region shall be restricted to less than ten percent relative to that measured in the visible region (380 to

700 nanometers) for any given secure blackout light source.

4.5.5 Secure blackout stoplamp. The secure blackout stoplamp shall meet the requirements specified in 4.5.5.1 through 4.5.5.4.

4.5.5.1 Visibility of beam. The secure blackout stoplamp filter lens shall be opaque except for the Y-shaped opening which shall emit amber light.