The 40x40x900 ceiling lamp by the German manufacturer Gera is operated with an integrated LED. This LED ceiling lamp is in the finishe aluminium-coloured. The aluminium ceiling light is 90 cm long, 4 cm wide and 4 cm high. The luminaire connection is 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 lamps from this series (e.g. in L-shape), rooms of any size can be illuminated. If necessary, 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 can be controlled via voice control.