| BASE STYLE | MEDIUM SCREW |
| BULB STYLE | A (ARBITRARY DESIGNATION) |
| BULB DESIGNATOR | A-21 |
| OVERALL LENGTH | 5.250 INCHES NOMINAL |
| BULB LIGHT TRANSMISSION CHARACTERISTIC | TRANSLUCENT |
| EMITTED LIGHT CHARACTERISTIC | WHITE |
| FILAMENT DESIGNATION | C-2R OR |
| CC-8 |
| WATTAGE RATING | 50.000 WATTS AND |
| 135.000 WATTS AND |
| 185.000 WATTS |
| VOLTAGE RATING | 120.000 VOLTS NOMINAL |
| CURRENT RATING FOR WHICH DESIGNED | 0.417 AMPERES MINIMUM AND |
| 1.542 AMPERES MAXIMUM |
| LIGHT OUTPUT RATING | 580.000 LUMENS NOMINAL 1ST RATING |
| 2330.000 LUMENS NOMINAL 2ND RATING |
| 2910.000 LUMENS NOMINAL 3RD RATING |
| RATED AVERAGE LIFE | HOURS |
| AVERAGE LIFE RATING IN HOURS | 1200.0 AND |
| 1500.0 |
| BURNING POSITION | ANY ACCEPTABLE |
| FILAMENT HEAVY DUTY SERVICE RATING | NOT RATED |
| LIGHT CENTER LENGTH | 3.875 INCHES NOMINAL |
| SPECIAL FEATURES | ENERGY SAVER |
| CRITICALITY CODE JUSTIFICATION | FEAT |