A Mercury Vapor Yard Light has 3 items that could cause the stated problem. One of the more common HID light used for outdoor lighting was a mercury vapor lighting system. Entomologists and insect enthusiasts use mercury vapor lights to collect a variety of night-flying insects. The Designers Edge Twist Lock Dusk to Dawn Photo Cell replaces all brands of photocells for your area light. The ballast regulates the current to the lamps and provides sufficient voltage to start the lamps. Wire the Neutral and Line voltage wires directly to the light fixture tombstones. The sensor has to be in its socket to test it as it needs power to it to operate. They send a high voltage in across the arc tube and the mercury inside the arc tube conducts and starts to ionize (glow). Fluorescent lamps create light by ionizing mercury vapor that is contained in the glass tube. The main thing I'm wondering is, how would I go about wiring it up? I got around to opening the case the other day, and found that it was equipped with a GE R100-series mercury vapor lamp, as well as a two-wire ballast and a three-wire photosensor. The ionized mercury vapor emits photons of light. How does a ballast work? 1) Bulb: Replace it with the exact same wattage. Not sure of the vintage, but the tag inside identifies it as a catalog # 13-1612. Right around 1900 the mercury arc rectifier was developed, this luminous device was very important for power conversion. The ballast keeps … One would tip the light to get it to start. A mercury-vapor lamp is a gas-discharge lamp that uses an electric arc through vaporized mercury to produce light.The arc discharge is generally confined to a small fused quartz arc tube mounted within a larger borosilicate glass bulb. This works on mercury vapor, high pressure sodium or metal halide fixtures. The mercury vapor lamp works by creating an electric current to mercury vapor within a sealed glass jacket. Not really a filament inside. A mercury vapor lamp uses a small arc tube enclosed within the larger outer globe. 2) Ballast: MUST match the bulb's wattage and while an EXACT replacement (size and mounting means) are not imperative, these two items make doing this job A … It is ul and cul Co-worker says that's hog wash and knows a number of electricians that use MH bulbs in a MV fixture with supposedly good results. Instead of a near-vacuum, the mercury vapor light has a fill gas pressure close to that of surrounding air, and the gap between the electrodes is much, much smaller. Mercury Vapor Light Fixture Wiring Last night I started fiddling with the unit but found two white wires versus a black and white. An early mercury vapor lamp. Through research I have found that mercury vapor bulbs can be used in metal halide fixtures but a metal halide bulb cannot be used in a mercury vapor fixture. 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