5pcs LED Circuit Boards USB Light Keychain Super Bright 6 LEDs Mini USB Light Lamp with Smart Touch Electrodeless Dimming Switch for Laptop Keyboard Light(Warm White), Qty:5

Great LED lights. Dim-able and not super bright. The other ones I ordered were very bright which in some cases would work just fine but I needed something that would just give me enough light to see in a dark corner by my desk. Very happy with my perches. It has more of a warm glow to it. Not bright white. Which I liked.

While I could simply use my phone's LED flash as a flashlight, the reality is such LEDs are meant to be used as a camera flash strobe. There is no room to dissipate the heat generated by the LED, so when it's left on for an extended time period, the light itself would be shut off to prevent overheating. As the primary purpose of a flashlight is a light source, having it shut off - while still having ample power available - is not a desirable "feature". These LED "sticks", coupled with a USB OTG adapter, allow me to use my phone as a flashlight - without the overheating.As the instructions are a bit unclear, this is how the sticks work:- Insert the stick into the USB port. Note, it has contacts on both sides of the stick, so you can have the LEDs shine away from you.- The light does not turn on when you insert the stick, or re-insert after a removal. To turn it on, do a LONG TAP on the reverse side of the LEDs.- After it's turned on, a LONG TAP adjusts the light intensity.- A SHORT TAP turns the LEDs off - to turn it back on, do a LONG TAP.- The light intensity is kept in memory as long as the stick itself stays in the USB port. If the power is removed from the port at any time (either from physically removing the stick or power loss), the intensity setting is lost and it defaults to the brightest setting.- The lowest setting produces a very small amount of light and is safe to stare at with your eyes. At all other settings, the light intensity should be treated no differently than conventional LED flashlights - do not stare directly at the light.The power consumption of the stick depends on the light intensity. Using a PortaPow USB Power Monitor, the lowest setting registered less than 10mA of current (my monitor can detect up to two decimal places only), while the brightest setting is about 250mA. As it's well below the standard USB power specification of 500mA, these sticks can be used in almost any USB port - just remember that it doesn't turn on right away.Compared to the 3 LED sticks (http://www.amazon.com/gp/product/B00LUTGWBG/), which I also have:- the 6 LED sticks are dimmable anywhere between 50mW and 1250mW, while the 3 LED sticks always shine at their default 500mW setting- the 6 LED sticks need to be turned on at first with a long tap, while the 3 LED sticks turn on as soon as they're inserted into the USB port- the 3 LED sticks are shorter by a full USB port depthThe one disadvantage these sticks have vs conventional flashlights is lack of focus. The light projected is omni-directional, so a DIY reflector is required to make it shine in one direction.Pairing one of these 6 LED sticks with a lipstick-style external battery pack creates a rechargeable (and dimmable!) USB flashlight. As such, it's better than the LED flashlights built into many battery packs these days, because these are user-dimmable. Likewise, pairing this with a USB OTG adapter creates a flashlight that is powered by an Android phone, but without the overheating issues or privacy concerns associated with most flashlight apps.Highly recommended.

These lights are very bright. Most of the reviews suggest keeping one on a keychain, not sure what good that would do though, unless you keep a usb battery in your pocket. I lit up all five at once and it was just as bright as the 60 watt bulb in my lamp. I'm a bit apprehensive about using them for prolonged periods because they get pretty warm. Not quite sure how I plan to use these yet. I guess they would come in handy during a power outage or while camping. Took off one star because of how hot they get. I'm afraid it might damage my battery.Update: I just burned my fingers taking this out of my battery. It was only on for a few minutes. This thing cannot be safe to use. It will melt my battery if I leave it on for more than a few minutes. These things are potentially dangerous.Yitee sent me an email asking me to change my review to five stars. They claim that this will produce "a little heat." No, it was so hot I could not remove it from the battery without burning myself. There is absolutely no way that I am going to plug these into my laptop or my expensive battery. Would you rest a curling iron on you laptop? Well, that is what this thing felt like when I removed it from the battery after just three minutes.UpdateI gave these lights another try with an old usb battery that I forgot that I had. I didn't care if the battery got damaged or not, so I plugged in two of the lights and just let them run for a few hours. In this battery, they did not get as hot and they worked fine. It seems that they get really hot in my Anker battery, but with this battery, they work fine. The Anker battery has what they call "IQ" that is supposed to be a variable amperage based on the needs of the device that is plugged into it. This older battery has no such technology and it works fine. I am only guessing, and I don't want to pretend to be an expert with this technology. However, maybe the variable amperage in the newer battery might be the reason. I don't know, but either way, I have updated my review, and I want to apologize to Yitee. I wont use these in the Anker battery anymore, but now I've found a new use for this old battery.