scope:

This specification covers the general requirements for lampholders, indicator lights, indicator-light housings, and indicator-light lenses including display and integral lamp driver network types and associated hardware. For the purpose of this specification, an indicator-light housing is an indicator light without a lens (see 6.5).

The type designation of lampholders and indicator-light housings shall be in the following form, and as specified (see 3.2 and 6.2):

LH72 /1 Style Type (1.2.1.1) (1.2.1.2)

The style is identified by a two-letter symbol "LH" followed by a two-digit number.

The applicable types based on circuit or mechanical parameters are identified by one or more digit numbers. The numbers shall follow and be separated from the style number by a slash mark.

The type designation of lenses shall be in the following form, and as specified (see 3.2 and 6.2):

LC/2 B T 2 Style Color Transmit- Lens (1.2.2.1) (1.2.2.2) tance material (1.2.2.3) (1.2.2.4)

The style is identified by a two-letter symbol "LC" followed by a two-digit number.

The color of the lens shall 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 trans- mittance 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). ¹Not recommended for use with neon lamps.

The lens transmittance shall be identified by a single letter in accordance with table II. TABLE II. Transmittance.

Symbol Transmittance ------------------------------------------ D¹ Diffusing² N Nondiffusing T¹ Translucent³ O¹ Opaque⁴ B¹ Translucent/black overlay^{5 1}Not recommended for use with neon lamps. ²In these lenses diffusion shall be accomplished only by the surface closest to the lamp. ³In these lenses the diffusing media shall be dispersed throughout the transmitting glass or plastic material. ⁴In these lenses no light shall be transmitted or reflected. ⁵Lens, prior to black overlay, shall be translucent. Exterior viewing portion of the lens excluding any legend(s) shall be covered with a black lusterless finish.

The lens material shall be identified by a one-digit number in accordance with table III. TABLE III. Lens material.

Symbol Material ---------------------------------------------------- 1 Glass (−65°C.to +200°C.) 2 Plastic (−55°C.to +71°C.) 3 Plastic (−55°C.to +125°C.)

The type designation for indicator lights with non-replace-able lens and nomenclature display types shall be in the following form and as specified (see 3.2 and 6.2):

LHC82 /1 BT1 Style Type (1.2.2.2 (1.2.3.1) (1.2.1.2) to 1.2.2.4)

The style is identified by a three-letter symbol "LHC" followed by a two-digit number.

intended Use: