They appear to create light using what can only be imagined as a filament. No, I'm not an electrical engineer, but I bought them after sitting in the dark for a few days. Can't comment on durability yet and if I remember how long it would take for one of them to die I might update this review. Anyway they are bright and considering they were hard to find in a regular store it's nice to know I got so much for what 2 packs would cost.
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