What element is also known as hydrargyrum?
Hydrargyrum quartz iodide Hydrargyrum quartz iodide Hydrargyrum quartz iodide (HQI) is a trademark name of Osram's brand of metal halide lamps made for general floodlighting, arena floodlighting, shop and commercial and industrial lighting. "Hydrargyrum" is the Latin name for the element mercury. When heated, mercury vapour is created inside the lamp, and deposited when it cools. An HQI lamp consists of a protective outer glass shield surrounding two heavy wires which are inserted into each end of a smaller inner bulb containing a gas. The lamp is powered by an electrical ballast, which regulates the current flow through the arc in the smaller
Hydrargyrum medium-arc iodide lamp element on the lamp head cracking from thermal shock (though not completely blowing out or shattering). Proper safety procedures should always be followed when using HMI units, as they can be quite dangerous if misused. In 2014, journalist Kerry Sanders reported that he had been blinded for 36 hours as a result of overexposure to ultraviolet light from a malfunctioning HMI lamp. However, had the fixture included UV protection as is required by OSHA, the output from the lamp would have had no effect. Hydrargyrum medium-arc iodide lamp Hydrargyrum medium-arc iodide, or HMI, is the trademark name of Osram's brand