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Small clear tubular incandescent bulb with single-contact bayonet base

GE

GE 1939X 50 W 28 V T7 BA15s standard bulb

SKU CH-YS85-G8SB7

A 28 volt, 50 watt incandescent lamp with a BA15s base rated for 300 hours of service life

  • Selling Unit1
  • TypeIncandescent Bulbs
  • Wattage50
  • 50 W output at 28 V for reliable aircraft lighting
  • 300-hour rated life supports extended service intervals
  • BA15s single-contact bayonet base enables direct replacement
  • C-2V filament design delivers 18 lm/W efficiency
  • Trusted GE OEM quality ensures consistent performance

Aircraft low-voltage replacement

This GE 1939X incandescent bulb delivers 50 watts at 28 volts with a T7 shape and BA15s single-contact bayonet base. It is built for aircraft low-voltage lighting systems and rated for 300 hours of operation. The gas-filled envelope and C-2V filament provide 18 lumens per watt for consistent output. Suitable for maintenance crews needing a direct OEM replacement.

Direct bayonet fit with pair replacement

Installation is a simple push-and-twist into the BA15s socket, requiring no tools or wiring changes. The manufacturer notes that light output dims gradually over the rated life, so replacing bulbs in pairs keeps illumination balanced. No ballast or driver is involved, reducing failure points during swap-outs. Legal for on-road use where the same base and voltage apply.

Steady output until end of rated life

Under continuous 28-volt supply the filament maintains stable brightness for the 300-hour rating without thermal throttling or colour shift. Gas filling limits filament evaporation, so lumen depreciation follows a predictable curve rather than sudden drops. The bulb is not designed for frequent on-off cycling, which shortens the rated life. Sustained load performance matches the published 18 lm/W figure throughout the service interval.

Highlights

  • 50 W output at 28 V for reliable aircraft lighting
  • 300-hour rated life supports extended service intervals
  • BA15s single-contact bayonet base enables direct replacement
  • C-2V filament design delivers 18 lm/W efficiency
  • Trusted GE OEM quality ensures consistent performance

Specifications

Selling Unit1
BrandGE
TypeIncandescent Bulbs
Wattage50

Questions about this item

How do I verify the bulb is working correctly after installation?

The bulb should illuminate immediately at full brightness on a 28 V circuit; rated output is 18 lumens per watt and the filament is a C-2V type designed for 300 hours of service.

What comes in the package and are any extra parts needed?

The selling unit is one 50 W T7 bulb with a BA15s single-contact bayonet base; no additional components are required for direct replacement.

Which version should I choose between the 1939X and 34021 designations?

Both numbers refer to the same 50 W 28 V T7 BA15s aircraft lamp, so either designation identifies the identical product.

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