While I could easily use my phone's LED flash as a flashlight, the reality is that such LEDs are meant to be used as a camera flash. Flash The heat generated by the LED cannot be dissipated, so the light will turn itself off if left on for a long time to avoid overheating. Since a flashlight's main purpose is to provide light, turning it off - when there is enough power - is not a desirable "feature". These LED "sticks" in combination with the USB OTG adapter allow me to use my phone as a flashlight - without overheating. Since the instructions are a bit unclear, the sticks work like this: - Plug your flash drive into a USB port. . Note that it has pins on either side of the stick to allow the LEDs to glow from you. The light does not turn on when you insert the stick or reinsert it after removing it. To turn on, LONG PRESS on the back of the LEDs.- After turning on, LONG PRESS adjusts the light intensity.- SHORT PRESS turns off the LEDs. To turn them back on, press LONG PRESS.- The intensity of the light is stored in memory as long as the USB stick itself remains in the USB port. If power is removed from the port at any point (either by physically removing the flash drive or by a power failure), the intensity setting is lost and defaults to the brightest setting. The lowest setting gives very little light and is safe. see with your own eyes. At all other settings, light intensity should be treated as with conventional LED lights - do not stare directly into the light. The power consumption of the stick depends on the light intensity. With the PortaPow USB Power Monitor, the lowest setting registered a current of less than 10mA (my monitor can only see up to two decimal places), and the brightest setting is around 250mA. Since this is well below the standard USB power supply of 500mA, these sticks can be used with almost any USB port - just keep in mind that they don't turn on immediately. Compared to 3 LED sticks (http://www.amazon.com/gp/product/B00LUTGWBG/) which I also have: - 6 LED sticks dimmable from 50mW to 1250mW while 3 LED sticks always are switched on with a default setting of 500mW - 6 LED sticks must be switched on first with a long press, while 3 LED sticks switch on as soon as they are plugged into the USB port - 3 LED sticks are around the full depth of the USB ports shorter. The only downside of these sticks compared to regular flashlights is the lack of focus. The light emitted is omnidirectional, so a homemade reflector is required to make it shine in one direction. Combine one of these 6 LED sticks with a lipstick style power bank to create a rechargeable (and dimmable!) USB flashlight. So it's better than the LED lights that are built into many battery packs these days because they can be adjusted by the user. Likewise, when coupled with a USB OTG adapter, it creates a flashlight that's powered by an Android phone, but without the overheating or privacy issues associated with most flashlight apps. Highly recommended.
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