Freshwater aquarium lighting is commonly provided by screw-in incandescent bulbs, fluorescent tubes and LED lamps.
The designation Exx refers to the base diameter in millimeters (i.e., E12 has a diameter of 12 mm.) This is distinct from the bulb glass size which in the U.S. is given in eighths of an inch (i.e., A19, MR16, T12).
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