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Osram

54261 64250 OSRAM ESB/FHE 20W 6V G4 HLX Halogen Lamp
5.49 USD
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Match 54261 / 64250 HLX, ESB / FHE / M/33, and the complete 20W / 6V / G4 precision-lamp specification. Similar G4 capsules with different voltage, filament geometry, light-center length, or envelope dimensions are not automatic substitutes.

Specifications
Manufacturer OSRAM
Order code 54261 / 64250 HLX
ANSI / industry codes ESB / FHE / M/33
Technology Tungsten-halogen precision optical lamp
Wattage 20 W
Voltage 6 V
Base G4 two-pin
Finish Clear
Luminous flux 460 lm
Color temperature 3350 K
Color rendering CRI 100
Average rated life 100 hours
Dimensions 31.0 mm long × 9.0 mm diameter
Light-center / bulb-length reference 19.4 mm
Illuminated field 2.3 × 0.8 mm
Product weight 1.20 g
Equipment compatibility

Historical ESB/FHE equipment references

The following equipment has been documented with the ESB/FHE 20W 6V G4 lamp family. Confirm the exact model revision, voltage, wattage, base, filament alignment, and lamp-compartment dimensions before ordering.

  • Accuscope 3000 microscope
  • Accuscope 3001 microscope
  • Accuscope 3002 microscope
  • Accuscope 3002-CB microscope
  • Accuscope 3004 microscope
  • Accuscope 3015 microscope
  • American Optical 10 microscope
  • American Optical 1031 microscope
  • American Optical 110 microscope
  • American Optical 1130 microscope
  • American Optical 1820 microscope
  • American Optical 410 microscope
  • American Optical H10 microscope
  • American Optical H110 microscope
  • American Optical Microstar 10 microscope
  • American Optical XCEL microscope
  • Bausch & Lomb 31-74-29 microscope illuminator
  • Bausch & Lomb Galen II microscope
  • Cynmar 700 microscope
  • Cynmar 3000 microscope
  • Eagle CM240 microscope
  • Labomed CX-013 microscope
  • Labomed LX400 microscope
  • Leica 13112000 lamp application
  • Leica Laborlux D microscope
  • Leitz Dialux 20 microscope
  • Leitz Dialux 20EB microscope
  • Leitz ELW500-245 microscope illuminator
  • Leitz Labolux 12 microscope
  • Leitz Laborlux 12 HL ME microscope
  • Leitz SM-LUX HL microscope
  • Leitz Vario Orthomat microscope
  • Marco CP2 chart projector
  • Marco Auto Projector CP-400
  • Mark V Labs ME-LUX microscope
  • Mark V Labs Metallurgical Spotlight
  • Mark V Labs MXT microscope
  • Mark V Labs MZ-75 microscope
  • Motic BA200 series microscope
  • Nikon Alphaphot KT microscope
  • Nikon Alphaphot KT2 microscope
  • Nikon E200 microscope
  • Nikon Labophot microscope
  • Nikon Labophot-1 microscope
  • Nikon Labophot-Pol microscope
  • Nikon Macro CP670 projector
  • Nikon Measurescope MM11 20W EPI/DIA
  • Nikon Measurescope MM40 6V 20W EPI/DIA
  • Nikon Measurescope TM1 EPI
  • Nikon Measurescope TM2 EPI
  • Nikon Optiphot microscope (older 20W configuration)
  • Nikon Optiphot 66 DIA base
  • Nikon Remote NP-3
  • Nikon S-C6/D6 QH illuminator
  • Nikon SMZ1 vertical illuminator
  • Nikon SMZ10 coaxial illuminator
  • Nikon SMZ10 DIA base
  • Nikon SMZU coaxial illuminator
  • Nikon SMZU EPI illuminator
  • Nikon TMS microscope
  • Olympus BH2 series microscope
  • Olympus BHT microscope
  • Olympus BHTU microscope
  • Olympus CH-30 microscope
  • Olympus CH20 microscope
  • Olympus CHK microscope
  • Olympus CHK2 microscope
  • Olympus CHS microscope
  • Olympus CK2 microscope
  • Olympus SS105 microscope
  • Olympus SZH series microscope
  • Olympus SZH-ILLB illuminator
  • Olympus SZH-ILLC illuminator
  • Olympus SZH-ILLK illuminator
  • Olympus VM-ILA transmitted-light base
  • Olympus VM-ILA-2 transmitted-light base
  • Olympus VMZ500 microscope
  • Parlec TM1000 toolmaker microscope
  • Parlec TM3000 toolmaker microscope
  • Reichert 410 microscope
  • Reichert 11075 chart projector
  • Reichert 11083 chart projector
  • Seiler Laboval 5 binocular microscope
  • Seiler Laboval 5 trinocular microscope
  • Seiler Microlux microscope
  • Seiler Microlux II SP flat-field microscope
  • Seiler V3000 microscope
  • Seiler Westlab microscope
  • Shin-Nippon SL40 chart projector
  • Solidex VL850 microscope
  • Swift 1000 microscope (newer model)
  • Swift 3D microscope
  • Swift 4D microscope
  • Swift 5D microscope
  • Swift M1000D microscope (newer model)
  • Swift M1001D microscope (newer model)
  • Swift M1002D microscope
  • Swift M1004D microscope
  • Swift M1005D microscope
  • Swift M3208 microscope
  • Swift M3300 microscope
  • Swift M3300D microscope
  • Swift M4000D microscope
  • Swift M4002D microscope
  • Swift M5 microscope (before 2008)
  • Swift M8000D microscope
  • Swift MA759 microscope
  • Swift MA759Y microscope
  • Swift SM90HF stand top illuminator (before 2008)
  • Swift Swiftmaster I microscope
  • Swift Y3H microscope
  • Unico G3800 microscope
  • Unico WF10X microscope
  • Unitron Examet microscope
  • Unitron Metallurgical Spotlight
  • Unitron MS-2 biological microscope
  • Unimet MR4 series inverted metallurgical microscope
  • Vanguard 1100AMHS microscope using 20W lamp
  • Vanguard 1200CM microscope using 20W lamp
  • Vanguard 1240 microscope using 20W lamp
  • Vanguard 1280 microscope using 20W lamp
  • Vanguard 1290 microscope using 20W lamp
  • Vanguard 1300 series microscope using 20W lamp
  • Wesco B-20 microscope
  • Wesco CXL microscope, serial 08xxx and higher
  • Westover 2305MC microscope
  • Wild M420 microscope
  • Wild M7A microscope
  • Wild M8 microscope
  • Wild ME microscope
  • Zeiss Axiovert 10/100 microscope
  • Zeiss Stemi 1000 microscope
  • Zeiss Stemi 2000 microscope
  • Zeiss Stemi 2000 C microscope
  • Zeiss Stemi 2000 C for KS ELISPOT
  • Zeiss Stemi 2000 CS microscope
  • Zeiss Stemi SV 11 microscope
  • Zeiss Stemi SV 6 microscope
  • Heine fiber-optic mini projector
  • Kowa X-ray viewer
  • Woodlyn Eye Chart projector
  • Woodlyn Standard projector
  • Woodlyn Insta projector

Some manufacturers used different lamps across serial-number ranges or illuminator options. The equipment manual and original lamp marking control.

Brand alternatives

ESB/FHE 20W 6V G4 choices

These stocked pages share the ESB/FHE electrical and base identity. Manufacturer photometrics, dimensions, and lamp construction are retained separately; verify optical requirements before substituting.

Documentation and safety

Safety: disconnect power and allow the equipment to cool before service. Keep the quartz envelope clean; use clean gloves or a lint-free tissue. Operate only in equipment designed for this 6V 20W precision lamp and follow the equipment manufacturer's service instructions.