- This is a large size tubular vintage Edison led light bulb, size is diameter 75mm, 310mm length. The glass stem inside this Edison led light bulb is about 270mm length, as we mentioned before, extra long glass stem is easy to break or damaged during transportation. Except for reinforcing the glass stem by increasing the thickness of the glass stem, using hard and quality glass instead of normal quality glass, we also can put a sucker plate at the end of the long tube glass stem, and put the sucker plate against the bottom of the glass bulb, then the glass stem is fixed to the bottom of the glass bulb by this sucker plate. And the sucker plate is elastic, almost same frequency and amplitude as the glass stem. So it can protect the glass stem from breaking efficiently. By this way, the large size Edison led light bulb is both nice looking and strong enough!
- We also can use a hot-shrinking tube to the glass stem, this is also a kind of efficient way to protect glass stem from breaking. But it is not much helpful when the glass stem is too long, for example, longer than 350mm. So if the glass stem is to much longer, we have to consider using sucker plate at the end of the glass stem or together with the hot-shrinking plastic tube.