How do you weld inside a sealed lightbulb?

Dahua  did a project recently that felt a bit like answering a quiz question.The challenge was to perform a brazing of a component inside a light bulb,after the vacuum is done and the base is welded in. The way to do it? We placed an 40kHz induction heating coil outside the bulb. For the project we used a brazing alloy ring specially formulated for induction brazing placed inside the light bulb. The solution is now in mass production. There's your quiz answer!