The 40x40x2400 ceiling lamp by the German manufacturer Gera is operated with an integrated LED with a power of 19 watts. This LED ceiling lamp is available in aluminium-coloured and black-brown (a very dark brown) finishes. The aluminium ceiling light is 240 cm long, 4 cm wide and 4 cm high. The lamp connection is located in the centre, directly at the connection terminal. This lamp is optionally available with a colour temperature of 2,700 Kelvin extra warm white and 4,000 Kelvin white. The LED ceiling lamp with square cross-section emits its light brightly and glare-free downwards. By combining several ceiling luminaires from this series (e.g. in L-shape), rooms of any size can be illuminated. If required, the integrated LED can be changed by the user. On request, the lamp can also be supplied in special lengths up to a maximum length of 4 metres. The lamp is also available with a Zigbee module on request.  ZigBee enables wireless communication via WLAN between a Smart Home device and existing building technology. Using ZigBee, lamps, electric shutters, heating and loudspeakers, among other things, can be controlled via voice control.