Big Project LED's
(4) 33 volt 100 watt LED's wired in series, with a 25 amp 800 PIV stud mounted rectifier for 127 vac operation. Dang I wish this would work, it would save me a lot of money. Or then it might make the ...
Forum Discussion
LScamper wrote:
MEX wrote:
"(4) 33 volt 100 watt LED's wired in series, with a 25 amp 800 PIV stud mounted rectifier for 127 vac operation. Dang I wish this would work, it would save me a lot of money. Or then it might make the prettiest smoke signal"
Don't forget that the peak voltage is 1.4 times the RMS voltage. 127 x 1.4 = 178V! It will make a pretty smoke signal.
Half Wave rectification without filter caps will result in HALF the voltage at 89V in theory but in practice generally you can count on about half of the AC RMS or about 60V-70V.
Assuming those LEDS are designed from 32V to 36 V or 96V-108V for three in series which should be well high enough.
However with the conditions of the electric service there I would be prudent to use a current limiting resistor (but that would require a very large one). I would recommend using a switching power supply (designed for such use) for each one which would protect the LEDs and provide a constant current source... Not a totally cheap solution but would be better in the long run...
