Light: low-energy-fluorescent-compact-light- 2 - CFL, Compact Fluorescent Lamp

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(Light): low energy fluorescent compact light 2 DHD.jpg
D=1998-04-19 [Apr 19, 1998]; S=35kB, 640x480; T=JPEG image [MIME:image/jpeg].

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low energy = low power, high-efficiency, efficient, "green" = Typically LED or CFL, such "low-energy" lighting is many times more efficient (in terms of light output power for given input electrical power) than "standard" incandescent tungsten-filament bulbs, which of necessity must get very hot and generate a lot of heat.
low energy fluorescent = An electric current from the lamp's ballast flows through the gas (which includes toxic Mercury/Hg) contained in the tube of a fluorescent lamp, producing UV (ultraviolet) light which then excites a white phosphor coating on the inside of the tube, which in turn emits visible light.
low energy fluorescent compact = CFL, Compact Fluorescent Lamp