The mercury vapor lights are horribly inefficient. A 250 watt MV light may draw over 5 amperes of power. The lamp is 250 watts, the ballast uses the remainder. The ONLY advantage of mercury vapor is long life, important where servicing the light is expensive. Another bad characteristic of MV is that the fixture uses the least power and gives the brightest light when the lamp is new. As the lamp ages, the light output declines and the power draw increases. The MV lamp really never burns out, but will eventually get so dim that the glow from it can be seen only up close in absolute darkness. No big loss for them to be discontinued.
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Today's Featured Article - The Tractor Parade: Story of a Case SC - by Bernie DeLon. On a early fall morning back in 1994, I opened the newspaper and happened to spy an article about a local antique tractor club having their annual show that weekend.
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