MIL-DTL-3661D
1.2.2 Type designation of lenses. The type designation of lenses will be in the following form, and as
LC23
B
D
3
Style
Color
Transmittance
Lens material
(1.2.2.1)
(1.2.2.2)
(1.2.2.3)
(1.2.2.4)
1.2.2.1 Style. The style is identified by a two-letter symbol "LC" followed by a two digit number.
1.2.2.2 Color. The color of the lens will be identified by a single letter in accordance with table I (see
3.4.9.2).
TABLE I. Color.
Symbol
Color
B1
Blue
C
Colorless (clear) (D and N transmittance only).
G1
Green (identification).
R
Red (identification).
E
Red (aviation).
W
White (aviation) (T transmittance only).
Y
Yellow (aviation).
D
Black (opaque).
S
Gray (opaque).
1
Not recommended for used with neon lamps.
1.2.2.3 Transmittance. The lens transmittance will be identified by a single letter in accordance with
table II.
TABLE II. Transmittance.
Symbol
Transmittance
D1
2
Diffusing
N
Nondiffusing
T1
Translucent3
O1
Opaque4
B1
Translucent/black overlay5
1
Not recommended for used with neon lamps.
2
In these lenses diffusion will be accomplished only by the surface closest to the lamp.
3
In these lenses the diffusing media will be dispersed throughout the transmitting plastic material.
4
In these lenses no light will be transmitted or reflected.
5
Lens, prior to black overlay, will be translucent. Exterior viewing portion of the lens excluding any
legend(s) will be covered with a black lusterless finish.
2
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