No.
yes we do as do most.
WARNING: This project is not for beginners as it involves AC Mains supply. Make sure that you have an adult / expert supervision if you are planning to implement a similar project.
Why do you need a rectifier as LEDs are diodes anyway? Most white LEDs are 4V so why not just put about 50 in series with a suitable resistor to limit the current?
Because they;d only light on half of the cycle so 50% brightness. Using rectifiers to invert the -ve cycle you get full wave DC so 100% brightness.
because they are bad at rectification and the reverse leakage current detroys them
You also get flashing at twice the rate of half-wave rectification, so less noticeable flicker.
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