025 AC lighting

First of all, the street lamps are pulsating because they are powered by an alternating current. Singapore uses 50 Hz AC supply, so the street lamps pulsate 100 times per second.

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Some people expect 50 pulsations per second. They have forgotten that a lamp lights up two times in each AC cycle: once during the positive half-cycle, and once more during the negative half-cycle.

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