Product Description
GE 1638 is a 29-watt, 28-volt S8 automotive and aircraft bulb with BA15d double contact bayonet base, measuring 2.00 inches in maximum overall length and 1.00 inch in diameter. Rated at 500 hours life, the bulb produces 402 lumens and 32 cd mean spherical candlepower, with a gas-filled construction for low voltage applications.
Specifications
Electrical
| Nominal Voltage | 28V |
| Wattage | 29W |
| Lumen Per Watt | 14 |
| Current Draw | 1.04 Amperes at 28V |
Material
| Base Material | Nickel-plated brass |
| Envelope Material | Borosilicate glass |
Part Numbers
| Manufacturer Part Number | 27504 |
| OEM Part Number | GE 1638 |
Frequently Asked Questions
Q: What are the electrical specifications of the GE 1638 bulb?
A: The GE 1638 is a 29-watt, 28-volt S8 bulb rated for 1.04 amperes at 28VDC nominal voltage. It produces 402 lumens and 32 candlepower mean spherical with a rated life of 500 hours.
Q: What base type does the GE 1638 use?
A: The GE 1638 features a BA15d double contact bayonet base with nickel-plated brass material. Confirm your fixture accommodates the BA15d bayonet configuration before ordering.
Q: What are the physical dimensions of the GE 1638?
A: The GE 1638 measures 2.00 inches maximum overall length and 1.00 inch in diameter. Verify these dimensions fit your fixture shroud or reflector clearance.
Q: What is the envelope material of the GE 1638?
A: The GE 1638 uses a borosilicate glass envelope with a gas-filled construction designed for low-voltage automotive and aircraft applications. This material provides thermal shock resistance.
Q: Is the GE 1638 suitable for vehicle application on electric lift trucks?
A: The GE 1638 is rated for automotive and aircraft use. Confirm your lift truck lighting system uses 28VDC nominal voltage and requires 29-watt S8 bulbs.
Q: How does the lumen output of the GE 1638 compare to other low-voltage bulbs?
A: The GE 1638 delivers 14 lumens per watt efficiency at 28V, producing 402 total lumens. This is typical for automotive halogen and incandescent designs. Consider brightness requirements for your application.