34-0226010-91 – Whelen Aerospace Technologies (WAT) Bayonet Lamp
Available now through the AirParts Aero marketplace.
Overview Section
The Whelen 34-0226010-91 is a high-output, heavy-duty Halogen Landing and Taxi Light designed for 28-volt aircraft electrical systems.1 Whelen Aerospace Technologies (WAT) is a premier name in aviation lighting, and this specific lamp is engineered to provide the intense, focused beam required for safe night operations, even in low-visibility conditions.2
Featuring a Large Single Contact Bayonet Base (BA15s), this 150-watt lamp is a direct replacement for various legacy incandescent bulbs. It is commonly found in the wing-tip or nose-gear light housings of high-performance singles, turboprops, and business jets.
Key Features Section
High-Intensity 150W Output: Delivers a powerful beam of light, providing significantly better runway illumination and "see-and-be-seen" safety than lower-wattage standard bulbs.3
Halogen Technology: Utilizes a halogen gas cycle to prevent the tungsten filament from thinning, resulting in a brighter, whiter light and a longer service life compared to traditional vacuum-incandescent lamps.
Bayonet Base (BA15s): The single-contact "twist-lock" base ensures a secure mechanical and electrical connection that resists loosening under the high-vibration environment of engine-out taxi and takeoff rolls.
28-Volt Optimized: Specifically designed for the higher voltage of turbine and high-performance piston aircraft, ensuring the filament is matched to the aircraft's charging system.
Heavy-Duty Filament Support: Built with internal ruggedized supports to survive the G-loads of landing and the harmonic vibrations of the airframe.
Standard Fitment: Designed to fit into standard 4.5-inch or specialized Whelen par-style light housings common across the GA fleet.
Technical Specifications Section
| Specification | Detail |
| Part Number | 34-0226010-91 |
| Manufacturer | Whelen Aerospace Technologies (WAT) |
| Voltage | 28 Volts |
| Wattage | 150 Watts |
| Current Draw | Approx. 5.36 Amps |
| Base Type | Single Contact Bayonet (BA15s) |
| Technology | Quartz Halogen |
| Average Life | 100–300 Hours (Application dependent) |
Aircraft Compatibility Section
The 34-0226010-91 is a common replacement part for many high-performance aircraft in the AirParts Aero inventory:
Beechcraft King Air: Often used in the landing/taxi light positions for the 90, 200, and 300 series with bayonet-style sockets.
Cessna Citation: Utilized in various wing-root or nose-gear taxi light configurations.
Piper Turboprops: Found in the nose-gear light assemblies of the Cheyenne and Meridian series.
Pilatus PC-12: Compatible with certain wing-tip or gear-mounted lighting configurations using Whelen housings.
Technical Applications & Safety
At 150 watts, this lamp generates a substantial amount of heat. It is designed to be cooled by the airflow during flight or taxi. Extended ground operations with the lights on while stationary can lead to heat soak within the light housing, potentially damaging the lens or internal wiring.
Safety Warning: Never touch the glass envelope of the halogen lamp with bare fingers. The oils from your skin will create a hot spot on the quartz glass, causing it to bubble or shatter when the lamp reaches operating temperature. If touched, clean the bulb thoroughly with isopropyl alcohol before installation.
Technical Engineering Insight
The engineering value of the Whelen 34-0226010-91 lies in its Luminous Efficacy. Unlike standard bulbs, the halogen cycle inside this lamp redeposits evaporated tungsten back onto the filament.5 This allows the filament to run at a higher temperature (producing a whiter light closer to daylight) without shortening the lifespan as drastically as a standard incandescent would at that temperature.
By choosing the 34-0226010-91 through AirParts Aero, you ensure the lamp's internal pressure and gas mixture meet the strict requirements for aerospace certification. This prevents the "browning" of the glass envelope, ensuring that your landing light maintains its maximum candlepower throughout its entire service life.
Installation & Maintenance Addendum
Alignment: Ensure the bayonet pins are fully seated and rotated into the "locked" position. A loose connection at 5.3 amps can cause arcing and melt the socket.
Housing Inspection: Check the reflector inside your light housing for dullness or peeling. A powerful 150W bulb like this requires a clean reflector to project the beam effectively.
Circuit Protection: Ensure your aircraft's landing light circuit is rated for the ~5.4 amp draw of this 150W lamp, especially if upgrading from a lower-wattage bulb.
**WHELEN 90033 series anti-collision light system Installation Guide [ Click Here ]
NOTES:
Whelen Part Number - Interchangeable with universal part number "24V150W" & Cessna part number "C17312-1".