| BASE STYLE | MEDIUM SCREW |
| BULB STYLE | A (ARBITRARY DESIGNATION) |
| BULB DESIGNATOR | A-21 |
| OVERALL LENGTH | 5.312 INCHES MAXIMUM |
| BULB LIGHT TRANSMISSION CHARACTERISTIC | TRANSLUCENT |
| EMITTED LIGHT CHARACTERISTIC | WHITE |
| FILAMENT DESIGNATION | C-7A |
| WATTAGE RATING | 100.000 WATTS |
| VOLTAGE RATING | 277.000 VOLTS NOMINAL |
| CURRENT RATING FOR WHICH DESIGNED | 0.361 AMPERES NOMINAL |
| LIGHT OUTPUT RATING | 1180.000 LUMENS NOMINAL SINGLE RATING |
| RATED AVERAGE LIFE | HOURS |
| AVERAGE LIFE RATING IN HOURS | 1000.0 |
| BURNING POSITION | ANY ACCEPTABLE |
| FILAMENT HEAVY DUTY SERVICE RATING | NOT RATED |
| LIGHT CENTER LENGTH | 3.875 INCHES NOMINAL |
| SPECIAL FEATURES | FILAMENT MATERIAL TUNGSTEN |
| SPECIFICATION/STANDARD DATA | 08108-100A-277V PROFESSIONAL/INDUSTRIAL ASSOCIATION SPECIFICATION |