Product Overview
28V 1.02A Single Contact Bayonet Base S-8 Indicator Lamp
Condition
Unused new old stock (NOS). Physical inspection confirms clear S-8 glass envelope with intact dual horizontal filament coils and BA15s single-contact bayonet base. Base contact shows mild surface age toning. Sold each.
Ships same or next business day from our Idaho warehouse. Honest pricing, no nonsense.
Online since 1999. We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Radion trade number 1683 is a 28-volt miniature incandescent lamp built in an S-8 bulb format with a BA15s single-contact bayonet base. Featuring a 2C-6 dual-coil filament arrangement, it draws 1.02 amps to deliver 32 mean spherical candlepower (MSCP) of illumination for aviation cockpits, instrument panels, and 28V industrial vehicular systems.
Key Features
- Industry trade designation: ANSI 1683 (MS25232-1683, MS35478-1683)
- Supply voltage: 28 V (AC/DC nominal)
- Current draw: 1.02 A (nominal power 28.6 W)
- Base type: BA15s (15 mm single-contact bayonet)
- Bulb shape: S-8 clear glass envelope
- Filament configuration: 2C-6 dual horizontal supported coils
- Light output: 32 MSCP
- Rated average life: 500 hours
Applications
- Replacing burned-out reading and utility flood lamps in 28V aircraft cockpits and cabin bulkheads.
- Servicing annunciator lights, warning beacons, and marker lights on military vehicles and heavy equipment.
- Bench testing vintage aviation avionics trays and 28V power bus indicator circuits.
- Custom maker builds and restoration projects requiring heavy-duty 28-volt incandescent lighting.
Frequently Asked Questions
What base style does this lamp require?
It uses a standard BA15s base, which features a 15 mm diameter metal sleeve with two opposing bayonet pins at equal heights and a single lead contact terminal centered on the bottom.
Can this bulb be operated on 12V or standard automotive systems?
Operating a 28V lamp on a 12V supply produces very dim output because the filament requires 28 volts to achieve full nominal brightness and temperature.
What industry numbers interchange with this bulb?
This lamp directly crosses to trade number ANSI 1683, military standards MS25232-1683 and MS35478-1683, federal stock number 6240-00-044-6914, and manufacturer equivalents such as GE 27557 and CM1683.
Built for 28-volt instrument panels and rugged avionics bays where standard automotive bulbs fail to survive. Push, twist, lock it into the bayonet socket, and restore your cockpit or equipment panel to clear working light.
