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 Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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