Tafellampen
For a reading lamp beside the sofa, the bottom of the shade sits best at eye level when you are seated - roughly 100 to 110 cm off the floor. Higher and the bulb shines into your eyes; lower and you lose the pool of light on your book.
Most lamps come without a bulb; the product description names the fitting, usually E27 or E14. Warm white around 2700 kelvin gives a living room its homely feel, while cooler light suits a desk. Whether a lamp dims depends on the bulb you fit, not on the lamp itself.
See also floor lamps and the rest of our lighting.