ThinkLight is a keyboard light present in most ThinkPad families of notebook computers. The series was originally designed by IBM, and then produced by Lenovo after 2005.
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A white or yellow LED (depending on model) is located on the top edge of the display, illuminating the keyboard to allow use in low-light conditions. It is activated with the key combination Fn-PgUp (the bottom left and top right keys of the keyboard). The on-screen display of ThinkPad computers will display a light on and a light off indicator. The ThinkLight can be activated when the monitor is on or off but not while the PC is off.
Some ThinkPads, like the Z and R series (though not all - some R61 and R32 models still have the white light) feature an amber (yellow) LED due to the lower cost, while other models, like the T series, use a white LED (which is generally preferred).[1]
The SL series omits the ThinkLight.
The HP EliteBook series notebooks contain a similar keyboard light called HP Night Light. Unlike the ThinkLight, it is activated by a physical button next to the Night Light, rather than a keyboard shortcut.
The Dell Latitude ATG series laptops have also contained a pair of red LEDs which are controlled in a very similar way to the IBM ThinkLight and also serve to illuminate the keyboard.
Some computer manufacturers have opted for keyboards back-lit by fiber-optics. Notebooks with this feature include the Dell Studio and Latitude series, some HP EliteBooks and some HP Envy models, and the Apple MacBook Pro and MacBook Air..
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