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As I said, I can swear. Unfortunately, reliable operation can't be concluded from the specification.Circuit in posted in 17 working several years for me, I didnt notice any changes on used LED, circuit is 24h on.
Safety exactly in which regard? A "safety analysis" without an explicite safety objective is pointless as well. I can imagine a lot of cases where redundancy regarding either voltage or current limiting (or both of it) function is required, as well as any kind of reliable circuit function. Some applications will e.g. demand three diodes in parallel, using fail-safe mounting technology etc.An approvals body, such as BSI, would want a circuit that can safely survive a single component failure in a mains-powered circuit (they call low voltage as under 42V). Appliances around you marked with approvals will be designed to like that. They would reject the 1-diode/1-resistor instantly, I'm afraid.
The low voltage diode point matters e.g. for the bridge rectifier, where a smaller (SOT-143) case can be used.