I didn't. I replaced a glass fuse with a glass fuse rated identically
admittedly it was a slightly larger glass fuse but it was rated the same. Admittedly ive done many silly things in my time. To be fair though on this occasion tested all the component's I could first with a multimeter having taken the unit off the wall. I used a phantom power supply to test the led circuit to see if it lit up when I put the fuse in. It did. It wasn't attached to the mains electricity supply. I did fully expect it to blow again when I reattached it to the mains but it didn't. Both it and I survived but I would not advocate anyone else doing it as my level of controlled silliness may not be matched by common sense in others. Thank you for your concern though