The Knapstein ELMA-30 is a ceiling lamp with a diameter of 30 cm. Its height is 10 cm. Through the white satinized glass of the lamp the light is emitted glare-free and directly downwards. The glass has a bayonet lock and can therefore be easily removed to replace the bulb if necessary. The ceiling light is available in polished brass, matt nickel-plated and chrome-plated surfaces. The ELMA-30 has an E27 socket that can be operated with halogen lamps or replaceable LEDs. The manufacturer Knapstein recommends LEDs as illuminant. In addition to this ceiling lamp, the series also includes a lamp with a diameter of 35 cm.