PartsTable TECHNICAL DATA SHEET
JULY 2026Technical Data Sheet

100B21/MERCULITE-120/MED/HOWDXLamp,mercury Vapor

Westron Corporation Dba Westron Lighting · NSN 6240-01-313-4765 · FSC 6240 · No Item Name Available
Verified by PartsTable
NSN 6240-01-313-4765 — this item is cataloged by the U.S. Government under National Stock Number 6240-01-313-4765. Primary manufacturer part number: 100B21/MERCULITE-120/MED/HOWDX.
Features
  • Lamp,mercury Vapor — FSC 6240
  • Voltage Rating: 120.000 VOLTS NOMINAL
  • Average Life Rating in Hours: 12000.0
  • Wattage Rating: 100.000 WATTS
  • Base Style: MEDIUM SCREW
  • Rated Average Life: HOURS
  • Bulb Designator: B-21
  • Bulb Style: B (ARBITRARY DESIGNATION)
Applications
  • Area illumination
  • Indicator and warning display
  • Navigation and signal lighting
General Description

The Lamp,mercury Vapor, cataloged under National Stock Number 6240-01-313-4765, is classified within Federal Supply Class 6240 (No Item Name Available) of the Lighting Fixtures and Lamps group. The primary manufacturer of record is Westron Corporation Dba Westron Lighting. Government technical data includes 9 verified specifications, sourced from the Federal Logistics Information System (FLIS). This item has 2 commercial cross-references from 1 manufacturer, enabling identification through both NSN and commercial part number lookups. 6 verified substitutes exist in the FLIS interchangeability database. Current acquisition status: Active.

Technical Specifications
ParameterValue
NSN6240-01-313-4765
Primary Part Number100B21/MERCULITE-120/MED/HOWDX
Item NameLamp,mercury Vapor
FSC / FSG6240 / 62 — No Item Name Available
ManufacturerWestron Corporation Dba Westron Lighting
StatusACTIVE
Voltage Rating120.000 VOLTS NOMINAL
Average Life Rating in Hours12000.0
Wattage Rating100.000 WATTS
Base StyleMEDIUM SCREW
Rated Average LifeHOURS
Bulb DesignatorB-21
Bulb StyleB (ARBITRARY DESIGNATION)
Bulb Light Transmission CharacteristicTRANSPARENT
Emitted Light CharacteristicCOLORLESS
Lifecycle & Compliance
Acquisition StatusACTIVE
HAZMATNo
Verified Substitutes 6
2825-00-148-180234100 INTERCHANGEABLE
Yoke
Northrop Grumman Systems Corporation Div Marine Systems
5950-00-223-3876 INTERCHANGEABLE
Coil,radio Frequency
5905-00-723-45521816387-2 INTERCHANGEABLE
Resistor,variable,wire Wound,pre
Honeywell Intl Inc Defense Avionics Systems
5930-01-157-9807341375 INTERCHANGEABLE
Switch,thermostatic
Sears, Roebuck and Co. Dba Sears Div Sears Commercial
5961-01-187-8077 INTERCHANGEABLE
Semiconductor Device,diode
4820-01-190-7095341-00 INTERCHANGEABLE
Seat,valve
Trac Regulator Co., Inc. Dba Trac Regulator Co Inc
Cross-Reference Index
Part NumberManufacturer
100B21/MERCULITE-120/MED/HOWDX PRIMARY Westron Corporation Dba Westron Lighting (USA)
34100 Westron Corporation Dba Westron Lighting (USA)
Related Parts
2825-00-148-1802INTERCHANGEABLE
YOKE
34100
5950-00-223-3876INTERCHANGEABLE
COIL,RADIO FREQUENCY
5905-00-723-4552INTERCHANGEABLE
RESISTOR,VARIABLE,WIRE WOUND,PRE
1816387-2
5930-01-157-9807INTERCHANGEABLE
SWITCH,THERMOSTATIC
341375
5961-01-187-8077INTERCHANGEABLE
SEMICONDUCTOR DEVICE,DIODE
4820-01-190-7095INTERCHANGEABLE
SEAT,VALVE
341-00

Frequently Asked Questions

What is NSN 6240-01-313-4765?

NSN 6240-01-313-4765 is a Lamp,mercury Vapor, manufactured by Westron Corporation Dba Westron Lighting, classified under FSC 6240 (No Item Name Available). Status: active.

What are the part numbers for NSN 6240-01-313-4765?

NSN 6240-01-313-4765 has 2 cross-referenced part numbers: 100B21/MERCULITE-120/MED/HOWDX (Westron Corporation Dba Westron Lighting), 34100 (Westron Corporation Dba Westron Lighting).

What NSN replaces 6240-01-313-4765?

There are 6 known substitutes for 6240-01-313-4765: 2825-00-148-1802, 5950-00-223-3876, 5905-00-723-4552 and 3 more. Verify interchangeability with system specifications before substitution.

What are the specifications of 100B21/MERCULITE-120/MED/HOWDX?

Key specifications for 100B21/MERCULITE-120/MED/HOWDX: Voltage Rating: 120.000 VOLTS NOMINAL; Average Life Rating in Hours: 12000.0; Wattage Rating: 100.000 WATTS; Base Style: MEDIUM SCREW. 11 total characteristics are documented in the Federal Logistics Information System.

Validated with multiple authoritative sources, including Government, OEM, and Certified sources.
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