Been a few years since retirement from the trade but I suspect that mercury vapors are no longer in production and given wag to led's. Mercury, whether florescent or vapor has environmental issues. Outdoor mercury vapor housings are large in size, made or metal, require thick glass lenses to disperse the light correctly and to handle the heat produced by the fixture. Housing size requires larger mounting brackets, bolts and space available on pole. Mercury vapors electrics eye sensors are larger and cost more. They also require maintenance on occasion to replace, ballest, bulbs and sensors. There is also the cost of said maintenance with a crew and truck. LED's cost more in production initially, cheaper to install, less maintenance and service costs, and more pleasing to the eye. Their sensors are built into the fixature, less space in/on fixture for bird/animal intrusion plus they are way more energy efficient. LED's are the future. Now, what Bob said is probably accurate. "Sounds like a good deal for them to save probably 75% of the power the old light used and charge you MORE for the priveledge!"
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Today's Featured Article - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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