- ANSI 1638 lamp features an S8 shape bulb with a double contact bayonet (BA15d) base
- It is typically used in low voltage aircraft applications
| Type | Bulbs |
| Style | Miniature |
| Color | Clear |
| Voltage | 28 VDC |
| Industry No. | 1638 |
| Max OAL | 2" |
| AVG life hrs | 500 |
| Base Style | Double Contact Bayonet (BA15d) |
| Candlepower | 32 |
| Shape | S8 |
| Application | Aircraft; Low Voltage |
