microtivity IL604 5mm RGB Slow-Rotating LED w/Resistors (Pack of 30)

I don't even need to write a review since I'm just going to agree with everyone else; these are amazing, pure & simple. Arrived on time, well packaged as I've found "microtivity" to ALWAYS do. Just as advertised. Frankly, I didn't even KNOW LEDs like this existed with a built-in PWM controller (I "assume" it's PWM, but I could be wrong here.) I'm quite familiar with driving RGB's with an Arduino and PWM, and granted these have a different "use model" than standard RGBs since you can't control the colors displayed by these, but that's the POINT. You don't HAVE to! Just plug 'em in, and ... there ya go!I don't think I'll ever use a regular LED again <ha ha>.And the included resistors are "nice," but I admit I was a tad confused at the inclusion of 100 ohm resistors. I took the time to actually measure the forward voltage drop of one while on and as expected it varies depending on which of the RGB LEDs in the package are on and how bright they're being told to be. It varies from ~2.6V to ~3.2V on my setup which makes sense. Now my small "setup" isn't USING those supplied 100 ohm resistors, I used 330 ohms I had laying around because I think 100 ohm results in just more drive current than you need. I'm using 5V to drive them. So with 100 ohm resistors that would be, using "good old Ohm's Law," 5V - 3.0V (I just chose 3.0 as a rough "average" of the forward voltage drop for the LED) or about 2.0V "left over" for the resistor to take care of. So "V = IR" or 2.0 = I * 100 or 20mA. That's actually quite reasonable. But I found that with a 330 ohm resistor, as I'm using, these are amazingly bright and only draw 6mA each and perform PERFECTLY! (I also measured that and yep, in the "real world" they're using just 6mA.) That too is impressive. (Just for fun I'm going to make a "glowing table lamp" with an old surplus "Line Insulator" I found. It's old, thick and "dirty" (aged) glass that I think would be "nifty") using 20 or 30 of these all on at once, so saving those "precious amps" using a 330 ohm will let me use a cheaper "wall-wart" supply for my "groovy light" (My wife said "Make it look like a lava lamp!" Uh, not quite, but she was impressed by these as well.)) So in case anyone's wondering, they are quite flexible in setting up your "power vs. brightness" needs. If I could make ONE change I'd add the ability to vary the fade rate, but I'm now just being "greedy."Did I saw "WOW!" I'm gonna buy more and put one in EVERYTHING. My dogs and cats will be the ENVY of their furry buddies when I strap on a collar with some of these babies! <grin>BUY THEM! Even if you don't NEED them, you'll find you DO! ;)

The media could not be loaded.  Work great repairing a couple Himalayan salt lamps. Didn’t use the resistors because it’s 5v 1a so they dim a lot, the original led in the small was the same 5mm with a 15ohm resistor and the large one had a 10mm with a 10ohm resistor.Series was fine, but I wired them in parallel which shouldn’t need a resistor.Update: definitely use a resistor, first day and red is flickering. I’m going to use the supplied resistors, but I think they dim just a little more then I want.To fix the salt lamp I put two LED in parallel and two resistors also in parallel, working great for a week now and still bright enough for my wife to be happy.

They're nice, they all worked right out of the pack (powered by 2 AAA cells in series, no resistor), they're really bright, no duds, and they're exactly as described on the tin.I honestly don't know what the included 200ohm resistors are for, unless for running directly off 5V/usb. It might've been nice to say what their intended purpose was, but that's not really a complaint (and I have a bunch of extra resistors to play with if I need them). :DMy only actual complaint/nitpick is that the colors don't transition too smoothly. For example, if pink/purple is displayed, it'll hold that color for a few seconds, and then abruptly drop the blue to leave just red. It's a fade, not a switch-off, but it's a *sudden* fade. I've seen color-transitioning Christmas ornaments and the like that do a *very* nice and buttery-smooth transition from color to color, so maybe I'm a bit spoiled. :)(Cup your hand in front of the LED a few inches away so that you can see individual but overlapping circles of color "projected" onto your palm, and you'll see what I mean.)Still, to have the 3 r/g/b LEDs *and* controller, packed on a single 2-terminal LED, that work from a paltry 3V, is pretty amazing. And at 30c per piece, I'm even *more* amazed.

This product is a set of 30 LED/resistor pairs. The LEDs are 5mm, with water clear housings. There are red, green and blue light emitters and a control circuit which turns them on and off over time. One or two colors are on at any time, resulting in light that's red, green and blue, as well as (roughly) cyan, yellow and magenta.There are only only two leads, which are for power: There is no way to control the flashing of the lights, which average (by my quick count) about 2 changes per second. Light output is quite bright (though I have no way of measuring it) and is stronger coming off the top of the LED housing. These LEDs are rated to accept 3.0 - 3.6 volts, and easily operate for days off of a typical 3V coin battery (CR2032, for instance), and are well-suited to make "LED throwies". The supplied resistors are rated at 200 ohms.Note that the same company sells a nearly identical product which rotates among the colors much faster, roughly two times every second (ASIN: B006S21S5U). So far, I have not had any problems with either product.