| BASE STYLE | THREE CONTACT MEDIUM SCREW |
| BULB STYLE | A (ARBITRARY DESIGNATION) |
| BULB DESIGNATOR | A-21 |
| OVERALL LENGTH | 5.938 INCHES MAXIMUM |
| BULB LIGHT TRANSMISSION CHARACTERISTIC | TRANSLUCENT |
| EMITTED LIGHT CHARACTERISTIC | WHITE, SOFT |
| FILAMENT DESIGNATION | CC-8 |
| WATTAGE RATING | 50.000 WATTS AND |
| 100.000 WATTS AND |
| 150.000 WATTS |
| VOLTAGE RATING | 120.000 VOLTS NOMINAL |
| LIGHT OUTPUT RATING | 560.000 LUMENS NOMINAL 1ST RATING |
| 1630.000 LUMENS NOMINAL 2ND RATING |
| 2190.000 LUMENS NOMINAL 3RD RATING |
| RATED AVERAGE LIFE | HOURS |
| AVERAGE LIFE RATING IN HOURS | 1200.0 |
| BURNING POSITION | BASE DOWN |
| FILAMENT HEAVY DUTY SERVICE RATING | NOT RATED |
| LIGHT CENTER LENGTH | 4.188 INCHES NOMINAL |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 58536 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | A-A-1966 |