Led calculation help???
#1
Driver
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Led calculation help???
So here's the ? I need to run 22 LEDs for a project I'm working on. The LEDs are 3.4v typical and 3.8 max, 20ma, 40kmcd. All 22 exceed input voltage so that's not going to happen. Using max voltage with 4 in series puts me at 15.3v. So if I run 4 no risistor needed?? If I hook 4 up to the battery the light and don't burn up. I don't want to have to open the lenses back up or burn up these expensive LEDs, so any and all help would be greatly apreciated. I know there are some very experinced led guys on here. OLT comes right to mind.
#2
Run them all parallel, if you do it in series, they will burn out and like a set of christmas tree light, one blows, they all go out. Run them parallel with a single resistor and call it a day. Resistors are cheap
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That crossed my mind. The only reason I wanted to go series parallel, breaking them down into circuits of 4, was due to space. This isn't on a pcb board but the light housing to make the projector glow when not on. But the more I think about it that might be the only way
#4
i just wiring 4 led in series and another 4 led in series to skip the resistor.
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