What you have to remember bulbs do not give out light. What they do is suck in the dark, this is why when a bulb blows you often see the dark base where is has sucked in as much dark as it can hold, even the humble wick on a candle goes black after use where it has sucked in all the dark. You will note the same with fluorescent tubes.
The above statement is as true as Apple being able to reinstate a smashed bulb.
If a bulb has sucked in all the dark around it then it extends an antenna to try and find more dark. This can be proven by burying a bulb in the garden or a plant pot and then waiting untill all the dark in the earth has been absorbed
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