High-grade zinc-aluminium safety luminaire for fitting on the ceiling. The square safety luminaire, which adapts to the ceiling design. Thanks to the snap-in mechanism between the upper and lower part, the luminaire has a harmonious look and appears closed all the way round. The luminaire is connected to the mains in the ceiling section. When closed, the luminaire is powered via contact plugs. This greatly simplifies mounting and makes convenient connection possible despite the small size of the luminaire.