MIL-DTL-16377J(SH)
3.7.11 Lumen maintenance for type III luminaires. Unless otherwise specified (see 6.2), luminaires shall be
designed to have a minimum lumen maintenance of 70 percent of their initial output at 50,000 hours in a
77 °F (25 °C) environment. The lumen maintenance testing shall be conducted as identified in 4.8.20.1 and
4.8.20.2. Luminaire seasoning is not required. The LEDs selected for use in a luminaire shall have available
IES LM-80 test data for a minimum of 6,000 hours and an L70(6k) > 36,000 hours based on the guidelines
developed in IES TM-21.
3.7.11.1 Lumen maintenance, ambient (1,000 hours at 77 °F [25 °C]). When tested in accordance with 4.8.20.1
the following criteria shall be met:
a. The measured LED case temperature (TS) shall be equal to or less than the maximum published case
b. Total lumen output, measured using photometric evaluations, shall not depreciate by more than 2 percent
before and after the 1,000-hour temperature test (see 4.8.6).
c. The measured drive current of the LED shall not exceed the drive current from the IES LM-80 test data for
the given case temperature (see 4.8.20.1).
3.7.11.2 Lumen maintenance, accelerated (1,000 hours at 122 °F [50 °C]). The high-temperature testing shall
be used to demonstrate that the luminaire is not adversely affected by the high-temperature environments
occasionally found on board ships. When tested in accordance with 4.8.20.2, the following criteria shall be met:
a. The measured LED case temperature (TS) shall be equal to or less than 30 degrees above the average
b. Total lumen output, measured using photometric evaluations, shall not depreciate by more than 10 percent
before and after the 1,000-hour temperature test (see 4.8.6).
3.8 Processes.
3.8.1 Treatment and processing of metals for corrosion-resistance. The treatment and processing of metals for
corrosion-resistance shall be in accordance with MIL-E-917.
3.8.2 Painting. Painting of metals to obtain corrosion-resistance shall be in accordance with MIL-E-917.
3.8.3 Finishing for fixtures and parts. When the salt spray test is specified in the applicable specification sheet,
the procedures of 3.8.1 and 3.8.2 for finishing fixtures and parts for corrosion-resistance shall be strictly followed.
When the salt spray test is not specified in the applicable specification sheet, the procedures for finishing fixtures
specified herein shall apply.
3.8.3.1 Cleaning. Cleaning shall be in accordance with the manufacturer s guidelines.
3.8.3.2 Surface preparation. The surface of metal parts shall be prepared for painting in accordance with the
manufacturer s guidelines. This operation may be combined with the cleaning specified in 3.8.3.1.
3.8.3.3 Finish. Final finish shall be baking enamel or powder coating of a commercial grade. Color shall be as
3.8.3.4 Types I, II, and type III, class 1 fixtures. Unless otherwise specified in the applicable specification
sheet, the color of the final finish applied to all exterior surfaces of Types I, II and Type III, Class 1 fixtures shall be
haze gray in accordance with color number 26270 of FED-STD-595; the color of the final finish applied to all
reflecting interior surfaces shall be white in accordance with color number 17875 of FED-STD-595, having a
reflectance factor of not less than 80 percent. Specular reflectors shall not be painted (see 3.7.6).
3.8.3.5 Types I, II, and type III, class 2 fixtures. Unless otherwise specified in the applicable specification
sheet, external and reflecting surfaces of Types I, II, and Type III, Class 2 fixtures shall be white in accordance with
color number 17875 or 17925 of FED-STD-595, having a reflectance factor of not less than 80 percent. Specular
reflectors shall not be painted (see 3.7.8).
19
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business