MIL-DTL-26202E
3.5.8.7 Filters. Lights shall be designed to use a color filter conforming to the MS. The color filter
shall be securely held in place between the housing and lamp by 3 spring clips, which are so
designed that a filter can be readily installed and removed. All lights shall be provided with the filter
clips (and necessary screws for attaching the clips) so that any light can be converted to a light of the
desired color by inserting the proper color filter. The clips and screws shall be fabricated of corrosion
resistant steel. Glass tape shall not be provided on the clips or filters. Unless otherwise specified,
filters shall not be furnished with the light (see 6.2).
3.5.8.8 Stray light shields. When required to prevent light leakage around the filters, stray light
shields shall be provided.
3.5.9 Lamps. All lights shall be designed to accommodate the lamp as specified on the MS. Unless
otherwise specified, lamps shall not be furnished with the light (see 6.2).
3.5.9.1 Lamp replacement. All lights shall be so constructed that burned out lamps can be readily
replaced.
3.5.10 Lamp identification marking. A metal or plastic disk or plate shall be permanently attached to
all lampholders, and shall be permanently and legibly marked with the complete MS part number (not
dash number) of the lamp to use for replacement. Letters shall be black on white background, and
extra white space shall be provided so that the detail identification can be shown. The surface shall
be suitable for marking with pencil or waterproof ink.
3.5.11 Light aiming. All components shall be indexed or keyed so that the light cannot be incorrectly
assembled or improperly aligned. No adjustments shall be provided except as follows:
3.5.11.1 Bidirectional and unidirectional lights, classes B and BB, will be aimed horizontally before
the holddown ring is tightened. Omnidirectional lights require no horizontal aiming. All classes B and
BB lights shall not have any provisions for Leveling or vertical aiming. (The base will be level when it
is installed in the pavement.)
3.5.12 Surfaces. All surfaces facing gaskets shall have a maximum roughness height rating of 125 μm
and a flatness of .020 maximum waviness height value in accordance with ASME B46.1.
3.6 Performance. The lights shall be capable of performing satisfactorily under the following
conditions:
3.6.1 Environmental.
(a) Thermal shock (see.4.5.6).
(b) Relative humidity up to 100 percent including conditions wherein condensation takes
place in form of both water and frost (see 4.5.2.2).
(c) Vibration (see 4.5.3).
3.6.2 Twenty-four hour operation. When tested as specified in 4.5.5, the lights shall be capable of
withstanding 24 hours of continuous operation without any evidence of cracking, blackening of
reflective coatings of the prisms; or damage to the gasket, or running or pulling away of the sealing
compound, or blistering of the paint.
3.6.3 Operation under load and stress conditions. The lights shall be capable of operating
satisfactorily under all load conditions specified in 4.5.7 through 4.5.12.
3.6.3.1 Leakage. When base-mounted lights are tested as specified in 4.5.4 and 4.5.8, there shall
be no evidence of leakage.
3.6.4 Light distribution and chromaticity.
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