MIL-DTL-24317B
3.4.7.3 Luminance. The measured photometric brightness in foot lambert shall be as specified (see
3.1). Tests shall be made under dark conditions, using lamps with a 0.34 ± .02 mean spherical
candlepower. An average of three readings shall be made across the face of the lens, when unit is
illuminated.
3.4.8 Color filters (when applicable, see 3.1). The color of color filters shall be in accordance with table
III and shall be of one of the following types:
3.4.8.1 Cap filters. Cap filters used to convert clear incandescent lamps to colored lamps shall be as
specified (see 3.1).
3.4.8.2 Lens assembly filters. The design, material, and thickness of filters used in lens assemblies
(behind lens and diffuser plates) shall be as specified (see 3.1).
TABLE III. Chromatically limits for illuminated colors.
Chromaticity limits 2100° Kelvin 1/
Colors
x
y
.195
.713
.286
.637
Green
.234
.575
.143
.650
.530
.442
.544
SL2/
Yellow
.402
.571
.584
SL2/
.596
.380
.607
SL2/
Amber
.351
.625
.636
SL2/
.655
.324
.667
SL2/
Red
.287
.690
.702
SL2/
.194
.254
.240
.213
Blue
.184
.147
.135
.187
y is not less than .400
x is not greater than .410
Whit
y-yo is not numerically greater than 0.03 x
e
(yo is the y coordinate of the Planckian
radiator for a given x)
1/ The chromaticities of the diffusing lenses or colored
filters expressed as x and y coordinates on the CIE
chromaticity diagram shall lie within areas bounded by
the coordinates listed for each color, using source
illuminate of 2100°K.
2/ SL-Spectrum Locus (where intersected by other of
coordinate pair).
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