| BASE STYLE | MEDIUM SCREW |
| BULB STYLE | BT (BULGED TUBULAR) |
| BULB DESIGNATOR | AT-21 |
| OVERALL LENGTH | 5.625 INCHES MAXIMUM |
| BULB LIGHT TRANSMISSION CHARACTERISTIC | TRANSLUCENT |
| LIGHT INTENSITY DISTRIBUTION FEATURE | INSIDE FROSTED |
| EMITTED LIGHT CHARACTERISTIC | WHITE, TRANSLUCENT |
| FILAMENT DESIGNATION | C-9 |
| WATTAGE RATING | 135.000 WATTS |
| VOLTAGE RATING | 120.000 VOLTS MINIMUM AND |
| 125.000 VOLTS MAXIMUM |
| LIGHT OUTPUT RATING | 1900.000 LUMENS NOMINAL SINGLE RATING |
| RATED AVERAGE LIFE | HOURS |
| AVERAGE LIFE RATING IN HOURS | 4000.0 AND |
| 5000.0 |
| BURNING POSITION | ANY ACCEPTABLE |
| FILAMENT HEAVY DUTY SERVICE RATING | EXTENDED SERVICE |
| SPECIAL FEATURES | ENERGY EFFICIENT; HIGH KRYPTON FILL; A TUBULAR CROWN WATT SAVER |
| CRITICALITY CODE JUSTIFICATION | CSMC AND |
| AGDV |