Mercury vapor lights are cheap and give off a lot of light but a 100 watt high pressure sodium and 100 watt metal halide both give off more lumens than the mercury vapor light. Us the metal halide if you don't like the orange glow of high pressure sodium.
I was thinking one day a 100 watt HPS light 75.00 vs 175 MV 25.00 again both having about the same output. The cost to run the extra 75 watts for 10 hr a day at 10 cents a kilowatt hour is an extra 7.5 cents a day. Doesn't sound like much but it takes 667 days to make up the extra cost. These lights should run for 10 years with no problems so a 2 year payback and then 8 years of savings at 25.00 a year that adds up pretty well in my book.
I know my math is not perfect cause electric rates are slightly higher here and other places but it gives you an idea of the savings and think of the power company if 1000 customers saved 750 watts a day.
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Today's Featured Article - History of the Field Marshall Tractor - by Anthony West. Any restorer who has some knowledge of turn of the century farm machinery, will recognize the name Lanz Bulldog!! This machine was to say the least unusual in its appearance. The huge flywheel and coffee percolator shaped exhaust. Along with square body lines and cylinder head protruding forward of the front axle. Would become the visual differentiation that people would quote to separate the Lanz from other period machines. The Marshall company based at the Briannia Works in Gainsborough
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