I bought two of these to light our computer keyboard so we could use it when the lights were out. I was going to cut an old USB cable to power these from the computers USB port. Unfortunately the desk was designed in a way that I couldn't do that. Instead, one of them became a nightlight (and I lost the other). I am using a 6-volt power supply and it is bright enough to light up the room, but not too brightly. Because it has three LEDs on it, everything casts three shadows. I plan on using these to make automatic emergency backup lights in the near future.

Better than the flexible strips that require dedicated control logic, the LED bar really is that last-minute item you have to add to your basket. Works very well from a small 5V-to-12V booster circuit, powered from and Arduino to light my acrylic enclosure - makes for a showstopper!