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Thats not even accounting for all the bots, alts and inactive accounts; it wouldnt surprise me in the least if the majority of those were bots or throwaways. Another benefit of lemmy’s setup is that individual servers will be fairly small so theres tons of space for smaller communities with higher quality discussion, even if it does end up causing duplicate communities across instances.
In the Wikipedia page there’s this formula
Just plug in values for the fence voltage and led. You can just set vswitch to 0 and Vled to 2V. It should be fairly insignificant compared to the fence voltage. It should be 10-20mA (0.01-0.02) to not kill the led.
The root of this is Ohms law: V=IR. Diodes cause a voltage drop rather than directly acting like a resistor which is why it’s subtracted from the input voltage.
Just put them in series. Make 2x, one in each direction to account for AC and DC