Gikfun 5mm LED Light Assorted Kit DIY LEDs for Arduino (Pack of 100pcs) EK8437

The voltage specs given by the vender is almost useless. It's the max current rating that matters and I didn't see a max current rating. All 100 Tested Good. The LED drops about 2 volts depending on the type of LED. Using a 12 VDC source and a 2.7K resistor that gave about 3.7 mA through the LED. My guess is that the max mA is about 20 mA. I wouldn't run more than 15 mA through the LED and 10 mA is plenty. As long as this parameter is obeyed, the LED should last years. Maybe decades. Maybe centuries. Who knows.

Works as intended. They even have a neat smell when directly connected to a 9V battery.

I used these in a library STEM program for challenged adults. We made tissue paper flowers which were then lit from the inside with these lights. The only negative is that the leads are a little too short for my purposes, so we had to change the final product slightly. But, will be using them again in making "magic wands" in a future program.

I was un-educated about LEDs and required voltages. These are excellent when you know how to apply them.

My daughter used these for a science project. Used a few Arduino digital outs and powered 10 or so LEDs from each output.

Love me some Gikfun stuff. It works and doesn't cost much, what more can you ask.

Good selection of colors and good price, delivery in timely manner.

Gave as a gift to go with a Raspberry Pi. Was as it should be!

My little actually received a bulb and copper tape, for the end of the year craft from remote teacher, and just loved it. So I immediately went online and found some reasonably priced and purchased. We have a ton of plans to make holiday cards, going forward and other small projects. This is perfect because Santa, has already grabbed a circuit kit, for Christmas, because we’re totally into things like this! Easy to use, and so simple for the kids to experiment with, without injury, obviously, keep and eye on the projects, but they can do them for themselves! Can’t wait to come up with new ideas, as we have many bulbs and a large roll of copper tape to go along with it all! Excellent product!

Every green, red and yellow LED couldn’t take the power and exploded, dangerous product. I only wanted the green LED’s now have to buy more elsewhere.

Works fine

My testing with actual results = only received 97 out of 100, missing 2 yellows and one red. Testing all leds I found that with 2 volts (best results) for the yellows and greens, had 4 yellows and1 green defective. The blue/ white/ and red leds performed best at 3 volts with only one red defective.

These worked without issues, though the green was pretty weak. Though it's been a while since I worked with these LEDs, I might have used the wrong resistance for the green. I only used them to light up the buttons of a controller, so I don't know how well they last if left on for a long while