How do White Super Bright Led as bright as possible?
I'm using the power supply 240 V AC, through a step transformer 12 V AC, through a rectifier bridge and through a capacitor. I connect 4 LEDs in series with a 1K ohm resistor. How do these indicators LED as bright as possible?
If you have a data sheet for LEDs that would be useful, while the other 20th value given is a reasonable value if you 're looking for maximum brightness you may want to know what your specific LEDs are rated for, if they are "super bright" valuation current could be higher. You also need to know the direct current voltage to use. Perhaps a typical forward voltage of white LEDs could be 3.4V, with 4 in the series that has 13.6V, which is more than 12 years, which could be why some said parallel would be better, but in reality is likely to have more 12V, a very lightly loaded bridge rectifier circuit is loaded to the filter capacitor voltage near the peak, not RMS, 12 * sqrt (2) ≈ minus 1.4V to 17V the collapse of the bridge and rounding down since not all will reach the top, you can call the 15V voltage is available about 15 to 13.6 = 1.4V, 1.4V / 20mA = 70Ω Now 1.4V is a very small difference, and if your particular LEDs have a slightly higher voltage, or transformer or capacitor is small you may not get maximum brightness. So I could put two series pairs in parallel, but each partner will set it own series resistance, putting a number of LEDs in parallel, in series with a resistor not working well, as there is a slight variation on the LED current will not equal at all (although if you are in the current series has to be the same, by definition), but if you can use a series circuit is the most efficient, in the above example, 1.4V * 20mA = 28mW lost, if you used all 4 LEDs in parallel, with 15 – 3.4 = 11.6 V drop necessary (580Ω) 11.6 * 4 * 20mA = 928mW loss, not a lot of power but ..
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