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Ten clear glass T7 bulbs with single-contact bayonet bases in a cardboard case

GE

GE 34021 1939X 50W 28V T7 BA15s Aircraft Bulb Case of 10

SKU CH-8740-TCDM5

Case of ten 50-watt 28-volt T7 incandescent bulbs with BA15s bases for aircraft low-voltage use

  • Selling Unit10
  • TypeIncandescent Bulbs
  • ColorSoft White
  • Base TypeBA15s
  • Wattage50
  • Voltage28
  • Case of 10 bulbs simplifies fleet maintenance
  • 50 W at 28 V delivers 18 lm/W efficiency
  • BA15s single-contact bayonet ensures secure vibration-resistant fit
  • T7 tubular shape fits tight aircraft fixtures
  • 300-hour rated life reduces replacement frequency

GE 34021 1939X Aircraft Bulb Case

This case contains ten GE 34021 bulbs, also marked 1939X. Each lamp is a 50 watt, 28 volt T7 incandescent with a BA15s single-contact bayonet base. The gas-filled envelope produces a soft white colour at 18 lumens per watt. The rated life is 300 hours.

Maintenance teams for 28 volt aircraft systems

The BA15s base and T7 envelope fit fixtures that call for this exact lamp. Buyers who need a different voltage, wattage or base type should look at something else. The short rated life means these are not suited for continuous-duty lighting where frequent replacement is impractical.

Sustained operation at rated voltage

At 28 volts the filament runs at its design point, delivering the stated 18 lumens per watt for the 300 hour rating. The C-2V filament and gas-filled atmosphere maintain stable output until end of life. The compact T7 shape limits thermal mass, so the bulb reaches full brightness quickly and cools rapidly when switched off.

Highlights

  • Case of 10 bulbs simplifies fleet maintenance
  • 50 W at 28 V delivers 18 lm/W efficiency
  • BA15s single-contact bayonet ensures secure vibration-resistant fit
  • T7 tubular shape fits tight aircraft fixtures
  • 300-hour rated life reduces replacement frequency

Specifications

BrandGE
Selling Unit10
TypeIncandescent Bulbs
ColorSoft White
Base TypeBA15s
Wattage50
Voltage28
ShapeT7
Item Count10

Questions about this item

What voltage must my aircraft lighting circuit supply for the 28 V GE 34021 bulbs?

The bulbs are rated for 28 V operation; the circuit must provide a stable 28 V supply.

Will the BA15s base on these T7 lamps fit the single-contact bayonet sockets in my older panel?

Yes, each bulb uses a BA15s single-contact bayonet base that matches existing sockets of that type.

How can I confirm the 50 W lamps are performing correctly after installation?

Each lamp draws 50 W at 28 V and produces about 18 lumens per watt; measure voltage and current to verify.

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