A-A-1974A
shall be designed to seat firmly into the end cap or lay flat against the battery case.
3.2.8 Lamp and lampholders. The lamps furnished with the flashlights shall be miniature flange base, tungsten filament, single contact, PR2 or PR3. When specified, the lamps provided shall be halogen or krypton bulbs such as KPR-102 or KPR-103, or similar. The lamps shall be solidly retained in place in the lampholder. When specified, the flashlights shall have a secure storage compartment for an extra lamp provided by the manufacturer. The storage compartment shall be designed to be easily accessible and hold the spare lamp securely.
3.2.9 Switch. The switch shall be mounted on the side of the case and shall be solidly retained in any position (“off”, “on”, or “flash”). Switches shall resist accidental movement to the “on” position. The switch shall be designed to permit easy operation of one finger of the hand holding the flashlight. The switch shall remain operative after 10,000 cycles from “off” to “on” and back to “off” when operated at 15 to 20 cycles per minute. The switch cycle test shall be performed with a constant DC voltage of 2.9 to 3.1 volts across the switch and a total closed-circuit resistance of 0.9 to 1.1 ohm. Switches on type 11 flashlights shall include a “flash” position.
3.2.10. Threads. Matching threads on the caps, rings, and case shall be capable of being tightened using a torque of 25 inch-pounds maximum. Threads of the type I flashlights shall not strip or ride over those of mating parts when a minimum torque of 50 inch-pounds is applied. Threads of the type 11 flashlights shall not strip or ride over those of mating parts when a minimum torque of 70 inch-pounds is applied.
3.2.11. Case. Type I flashlights may be either one-piece body construction or made with threaded end caps. Type 11 flashlights shall be made with end caps. The design of the case shall preclude metal parts of the flashlight from creating a closed circuit with the batteries, except with the switch in the “on” or “flash” position. The design of the case shall also preclude internal parts from abrading or otherwise damaging the batteries.
3.2.11.1 Styles. Style B flashlights shall be furnished with a permanent magnet attached to the case. The magnet shall be capable of holding the flashlight (with alkaline batteries included) to a vertical flat unpainted steel plate or sheet 0.060” or thicker for a minimum of 16 hours without movement. Style A flashlights shall be furnished without a magnet.
3.3 Performance.
3.3.1 Illumination. The beam candlepower (candelas) of the concentrated beam shall meet or exceed the values given in table I when the beam is projected onto a screen having 4 and 8 inch circles (10.2 and 20.4 cm) at a distance of 10 feet (3 m) . The test voltage shall be 1.2 volts per cell. The photometer shall be calibrated using a reference standard lamp with a color temperature of 2,856 degrees Kelvin. The photoreceptor shall have a minimum diameter of 1 inch (2.5 cm) and be equipped with a light filter to yield a response curve matching that of the International Commission on Illumination Standard Observer Curve (IES Handbook and IES LM 20). The readings shall be
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