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 - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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