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2. Electrical ballast - Wikipedia

   en.wikipedia.org/wiki/Electrical_ballast

   An electrical ballast is a device placed in series with a load to limit the amount of current in an electrical circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps to limit the current through the tube, which would otherwise rise to a destructive level due to the negative differential resistance of the ...

3. Metal-halide lamp - Wikipedia

   en.wikipedia.org/wiki/Metal-halide_lamp

   A metal-halide lamp is an electrical lamp that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides [1][2] (compounds of metals with bromine or iodine). It is a type of high-intensity discharge (HID) gas discharge lamp. [1] Developed in the 1960s, they are similar to mercury vapor lamps, [1] but ...

4. Fluorescent-lamp formats - Wikipedia

   en.wikipedia.org/wiki/Fluorescent-lamp_formats

   Ballast-swap replacement for 4 ft T12 40 W T8: 1.0, 25: 8: 59 F96T8: Ballast-swap replacement for 8 ft T12 75 W single-pin T12: 1.5, 38: 4 "25" F40UTSL Retrofit replacement for 4 ft T12 40 W on underpowered residential-grade rapid start magnetic ballasts. These are F40CW lamps made with lighter cathodes that can only handle a lower amount of power.

5. 32 types of saltwater fish for your aquarium - AOL

   www.aol.com/32-types-saltwater-fish-aquarium...

   3. Yellow watchman goby. Yellow watchman goby coming out of hole. A rather grumpy-looking goby thanks to its downturned mouth, these fish enjoy burrowing in the sand at the bottom of the tank and ...

6. 38M Toldi - Wikipedia

   en.wikipedia.org/wiki/38M_Toldi

   38M Toldi. The Toldi was a Hungarian light tank of World War II, developed on the basis of the Swedish Landsverk L-60. It was named after the 14th century Hungarian knight Miklós Toldi. The Toldi was made in several different variants including some armed with a 20 mm gun, some armed with a 40 mm gun, some fitted with schürzen plates, and ...

7. Electric eel - Wikipedia

   en.wikipedia.org/wiki/Electric_eel

   General biology. [] Electric eel skeleton, with the long vertebral column at top, the row of bony rays below. Electric eels have long, stout bodies, being somewhat cylindrical at the front but more flattened towards the tail end. E. electricus can reach 2 m (6 ft 7 in) in length, and 20 kg (44 lb) in weight.