Could some electronics guru pleas explain what a "self-ballasted" LED lamp mean ? I have seen LED lamps, running off the AC line, and powered by a simple small 5V 1 Amp SMPS, but what exactly does a self-ballasted LED lamp mean ?
In series with something that approximates a constant current source for some reasonable range of applied input voltages. Could be as simple as a crude ballast resistor or a semiconductor based device.
A bare LED has a rather rapid increase in current through it once it starts to glow with a slightly higher applied voltage leading vastly increased current and then total destruction if you go too high.
You can do some cute physics experiements plotting V-I curves for LEDs. eg.
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Expect some LEDs to be destroyed in this practical.
Thanks. Your explanation seems to be the most likely one. We were looking at specifications for certification of AC wall socket compatible LED lamp in as Asian country.
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