Kondinin Group last looked at machinery lighting during 2001. Back then, High intensity gas discharge lighting (HID) technology was new on the scene and impressed researchers with the comparative performance over conventional halogen lighting. Ten years on and there are hundreds of HID lights on the market. In addition to familiar names such as Hella, Narva and Lightforce, there are also numerous imported Chinese models available, each with varying levels of build quality. HID lights generate light by ionising, or eclectically exciting, pressurised gasses, such as Xenon in a glass, quartz or ceramic tube. Typically this requires a high voltage to start the light arc, which is why all HID lights will have an electrical 'ballast to initially invert the 12-volt input to thousands of volts.
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