Defect part 1 pcs. from customer was inspected by visual.we found that lamp appear white inside the bulb.After we check sealing area
found crack which It is leak point ( Lamp is not vacuum).
The sealing point of lamp is crack, the air and moisture flow through inside the bulb ,So the lamp is not vacuum.
When it was operated electricity.The combustion of filament with air ( Oxygen, moisture ) to make the filament is very hot
then filament broken finally, it occured white smoke and attached inner the bulb.