# LED Voltage Help

I recently purchased 10 led's from superbrightleds.com but I cant seem to figure out their voltage. I am not good with electrical terms (I am a noob with electronics) so the led's detail page just confuses me. If anyone could figur out the voltage of them by going to this page here it would be a lot of help. Thanks!

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6 years ago
3.8 V @ 30 milliamps

Steve
DBMods (author)  steveastrouk6 years ago
thanks a lot! i tried to figure it out for 2 hours one day with no luck!
The Skinnerz6 years ago
The maximum forward voltage, which is the maximum voltage accross the LED when it it working, is 3.8V, but it is best to run it at around 3.3V (2X 1.5V batteries will be fine)
6 years ago
3V won't light the LED properly.

Steve
6 years ago
Why not? (I'm not questioning your knowledge, I'm just interested as to why.)
6 years ago
Look at the graph of current against voltage. The forward volt drop is the volt drop at the operating current - so by definition, at any voltage BELOW that, you aren't getting the operating current to flow.

Steve
DBMods (author)  steveastrouk6 years ago
wait so what voltage should i run it off of 3, 3.3, or 3.8?
6 years ago
You HAVE to use a resistor, which depends on the supply voltage you have, to limit the current. Tell us what voltage you want to use, and I can size the resistor for you.

Steve
6 years ago
Steve knows more about electronics than me, so I'd follow his advice and use 3.8V, but I'd be interested to see how much difference there is between 3V and 3.8V
seandogue6 years ago
I'm sorry Steve, you're saying that he should operate these LEDS at the maximum specs? Best answer or not, that not right.
6 years ago
I don't think its a particularly bad design point for the leds chosen, yes, if they are in full outdoor ambients I'd have chosen a more conservative point, but here ?