Insert luminaire with Tuneable White Light (TWL) for suspended ceiling systems with visible T-profile module (625 x 625), homogeneous light image, acoustically absorbent surface (sound absorption coefficient = 0.5), innovative tube technology for glare-free lighting, energy-efficient lens optics with standard beam angle of 60°, no UV and heat radiation, high ease of maintenance, luminaire housing made of aluminum with micropoint optics, tool-free insertion in ceiling, pre-assembled for mains connection, operating device (LED converter) included (with DALI dimming)