Abstract: A fuel tester is provided, which may be used to test for the presence of a contaminant such as water in a sample of fuel. In one embodiment, the fuel tester is a tube with a receiving end configured to attach to a sample container. The sample container holds a sample of fuel obtained from a device such as an aircraft. The fuel tester also includes a light source, e.g. a light emitting diode that is positioned in the tube to emit light on the sample of fuel in the sample container. If water is present in the sample of fuel, the water will form a separate layer from the fuel. The water layer will appear as a lighter shade of color and the fuel layer will appear as a darker shade of color on visual inspection by a user. The non-uniformity in color of the sample will alert the user that water is present in the fuel sample.

Abstract: The present invention provides a high-intensity LED as a light source for use in hands-free illumination devices. In one embodiment, one or more high-intensity LEDs are incorporated in, or added to, headgear, such as an aircraft headset. The LEDs may be powered by a battery, an external power source, or both. Also provided is a kit and method of installation for retrofitting existing headgear with LEDs.

Abstract: A set of relatively small-sized devices is disclosed for safety and/or illuminative lighting in conjunction with a horse or similar animal, or with equipment associated with such an animal or with transportation devices for individuals. The devices include high-intensity light-emitting diodes (LEDs), which provide intense, high visible light while being lightweight and giving off little heat. Batteries and wiring are also provided, and are included within structure that are easily attached to and usable from tack such as stirrups, saddles, or harnesses, or easily attached to parts of bicycles or other person transportation.