What's inside a cheap LED tube... so you don't have to break one to find out, like I did
https://static.mamot.fr/media_attachments/files/113/736/535/493/701/657/original/67c5ddb45066b82e.jpeg
Can you spot when I installed new LED tubes where we used to have ~40 fluorescent 120 cm T8 tubes?* The new LEDs are 170 lm/W.
Thanks to the ever-helpful Alppi-Rauta staff for finding the model I was looking for when everyone else thought it impossible.
(*) No animals were harmed in the process, but some glass and plastic were shattered...
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