Xiaoyztan 100 Pcs LED Bead Chips DC 3.0-3.2V 280mA 1W Emitting Diodes LED Emitters Tiny LED Lamp Beads (White Light)

These LEDs are exactly what they're supposed to be, and behave like they should. Many people in the comments report that they think the polarity of the LEDs are reversed. Mine are the correct polarity and work exactly according to the datasheet. LEDs are tricky and these are for more advanced applications. You need to know how to build a circuit with them; you can't just apply power, they're likely to burn out. These generate a lot of heat and probably need a heat sink for most applications. Use a tested schematic or learn the math. If that's not in the cards for you then look at ADAFruit and similar educational parts that are meant for prototyping and learning circuits and come ready to apply power and use.

These little guys are super bright, I also ordered the 15 degree lenses for them to concentrate the beam. They work great with a single 18650 battery but they burn out when powered by two of them. They are also not rated for two of them, I just tried it to see if they would be brighter.

I love these things. They do everything I wanted, expected and wished for. Easy to use, especially when soldering one or more into what you want them to light up. I make RC model ships (big ones), some over 5 or 6 feet in length and these are the perfect interior lighting devices. A battery pack lasts forever with them, and they consume so little power. And it's easy to change to different colors with a brush on liquid color that I use. Does not seem to fade over time and use..... These are the perfect LED for my usage...

These guys are really bright, and the light they produce is very white. They do get hotter than your standard little led, but that makes sense as they produce a lot more light especially for how small they are. They also have a tiny negative mark on one leg and a positive mark on the other so you can easily see at a glance which is what.

I have a couple of these light panels that went dark. Checking the LED diodes individually, it turns out that, usually, it is one of the diodes that died and since they are all in series, the whole panel go dark. The good thing for these diodes is that they are easy to check with DMM. Setting to the lowest resistance range, the diode would light up so that the polarity can be matched up with those on the panel. Adding a little thermal grease (those left over from your CPU heatsink) to it help secure it in place before soldering. This should also help to dissipate its heat, prolonging its life. Since the panel (where the diode is mounted) is metal, you may have to stick your soldering iron on for a little longer for the solder to melt. Happy lighting!