LED is the most efficient. It is getting cheaper and has an extremely long lamp life.
Mercury vapor and fluorescent are pretty much the same thing. The old style fixture and lamp were about as inefficient as it gets. The newer versions with electronic ballasts work well down in the temperature range at pretty good efficiency.
High and Low pressure Sodium (HID)the Low pressure puts off a narrow band or yellow light making color rendition near impossible. The High pressure units cause strobing effects on the highways(tires turning backwards) but have much more efficiency than the Low units and better color.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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