I’m putting a sign together with a 8,000mah lipo battery and I need to light the iside of it so you can see the letters at night. Nothing too bright but needing even coverage along the 32” sign. I don’t know if I will need two, three, four of these go get it but I really need to know how to step the voltage down in the easiest way possible. If I use resistors do I use one at each module? If I do use resistors will the light dim the same way as the voltage drops?
I’m pretty much thinking female pigtail type charging porting directly to the positive and negative, then a switch in the positive out to the LED modules. Am I missing anything, is there anything you would add to improve it? Any odea of run time with two/three modules on there?
Thank you SUPER much in advance as this is stressing me out and I’m over thinking it for sure.
Hey how are you doing man? I’m pretty much a noob with electronics: there are far more knowledgeable members here, and I hope they will chime in. In the mean time I’ll expose my view just in case it my not be completely silly.
Ok so the led is a 3V led. I know that for example the XM-L2 or 219C leds in flashlights are called 3V leds as well. With these leds the light output varies considerably with very little change in voltage. So controlling the output via voltage is tricky, as it probably will result in output fluctuation.
This might be the case with the COB led you have linked as well. My first thought is not to build the driver yourself with resistors and such. One of the reason is described above. Perhaps you can ask the seller if there are standard drivers available, suitable to use with lithium ion, either 1, 4 in series, or 2 parallel etc. I think there should be drivers available.
Since it’s a 3V COB led, perhaps standard flashlight drivers for 3V leds will work as well? Be careful, as the spec says max 1W.
Perhaps a different approach is to look for a led/driver combo, so you don’t have to puzzle to build the driver yourself?
Hope this helps!
Edit:
I checked out the spec, and there is an input voltage range: Blue Voltage: 3-3.7V, and Red Voltage: 2-2.6V.
I see… hmmm… So you need something to convert the voltage to these levels… Well, I personally would look for something else, but like I said, I’m a noob with electronics…
