I take mine apart after they quit to see what failed.I find the transistors blown apart in some and some diodes fried.I haven't see any caps blown apart in them yet.
I love the old ones like the Panasonic in the OP.I have some Philips/Sylvania bulbs that I purchased about 21 years ago and a couple still work.The current crop of bulbs are terrible and lucky to get 2 years out of them. the heat kills them.
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