High Power LED 3W DC 2.4-3.8V Input / 700mA Output LED Chip Dimmable Led Light with Heatsink Aluminum Base Lamp Beads Ultra Bright Star Component Chip

Works great for a project box I created for work. Needed a bright LED indicator and this worked well into the build

I just double checked the polarity on mine and I'm still seeing remnants in my vision. Quite bright. Admittedly I didn't use a resistor and managed to burn out the red so don't be like me. Zero documentation on these but assuming they are made consistently if you hold them up so that the RGB lettering is right-ways up positive is on the left side and negative on the right. These ill work down to around 2-2.5 v but at that point they are very dim. Once you hit 5 or more they really start to shine. If you need to put out a light of any color and these are a good option.

For an $8 LED, you'd expect there to be complete documentation, but nope. The PCB has screen printing to identify the colors of the pins and pads, but they didn't bother including polarity. Even the technical drawing for the LED in the product description isn't accurate for the LED I received. While the voltage and current are accurate enough, I ended up doing some cautious experimentation to figure out the polarity. Headsink board seems promising, but felt it was worth making my comments and what I learned in a review before I got too far into implementing it into a project. It feels promising, but again, the lack of useful documentation is disconcerting.

I bought a few of these chips as replacements for the LED chips in my cheapo lightsabers. These chips work great for the purpose and are almost a perfect match for the stock chips. My only trouble was self inflicted because I had to solder all of the positive leads together (a consequence of my saber, not the product) but it all worked out in the end and has survived a few combats with no problem.

After looking around, I realized I paid way too much