| 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 | TRANSPARENT |
| EMITTED LIGHT CHARACTERISTIC | WHITE |
| FILAMENT DESIGNATION | 2C-2R |
| WATTAGE RATING | 50.000 WATTS AND |
| 100.000 WATTS AND |
| 150.000 WATTS |
| LIGHT OUTPUT RATING | 620.000 LUMENS NOMINAL 1ST RATING |
| 1560.000 LUMENS NOMINAL 2ND RATING |
| 2180.000 LUMENS NOMINAL 3RD RATING |
| RATED AVERAGE LIFE | HOURS |
| AVERAGE LIFE RATING IN HOURS | 750.0 |
| BURNING POSITION | HORIZONTAL |
| FILAMENT HEAVY DUTY SERVICE RATING | NOT RATED |
| SPEC/STD CONTROLLING DATA | |
| MANUFACTURERS CODE | 81348 |
| NON-DEFINITIVE GOVERNMENT SPEC/STD REFERENCE | WL101 |