My recent experience with GE E14 230V 9W "candle" is, the tube run too cool without the outer, so the efficacy lowers. But interesting, you might unscrew the outer without braking it and then screw it back, as you like... But there is no danger like UV, or explosion, as known from HID. First the tube is made from soft glass effectively blocking all UV. And second, fluorescents are low power tubes, so the internal pressure is well below an atmospheric, so it simply can never explode, even when the tube break during operation (unlike incandescents, what run at about atmospheric pressure, what explosively rises, when an arc is struck at EOL - mainly 230V types)
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