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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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