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An LED flashlight may contain different LEDs for white and colored light, selectable by the user for different purposes. Colored LED flashlights are used for signalling, special inspection tasks, forensic examination, or to track the blood trail of wounded game animals. A flashlight may have a red LED intended to preserve dark adaptation of vision.
The liquid crystal display (LCD) or LED display of the mobile device can send visual light signals in the form of colored display flashes. A color sensor, or an ambient light sensor, or a reverse biased LED can receive flashes from the mobile device, and send flashes back to the infrared light sensor on the mobile device. [3]
Infrared heating uses infrared lamps, commonly called heat lamps, to transmit infrared radiation to the body that is being heated. When a body with a large surface area needs to be heated, an array of infrared lamps is often used. The lamp commonly contains an incandescent bulb that produces infrared radiation.
Ronja Inferno: Range of 1.25 km (0.78 mi), invisible infrared light. Ronja Benchpress: A measurement device for developers for physical measurement of lens/LED combination gain and calculation of range from that; Ronja Lopipe: The original (discontinued) design using red visible light and a RS232 interface for a max 115 kbit/s PPP/SLIP link. [19]
The materials used for the LED have a direct band gap with energies corresponding to near-infrared, visible, or near-ultraviolet light. LED development began with infrared and red devices made with gallium arsenide. Advances in materials science have enabled making devices with ever-shorter wavelengths, emitting light in a variety of colors.
Dog owner Hails has discovered many of those ways since bringing home her Great Dane, Leo, but his reaction to his very first pup cup will live rent-free in her heart forever.