Switchable Color Temperature - SCCT for short. , Decide on your color temperature before installing the light! Simply set it to the desired color temperature using a switch. , Operating device: not included, Dimming: depends on operating device , Material: aluminum/diffuser disc and light guide made of PMMA (non-yellowing), Dimensions (LxWxH): 290x290x22 mm , Color rendering index Ra: 80 Color difference (MacAdam): 3 SDCM, Service life: 50,000 h (L80 B10), Recommended operating device:, Item no. 8980202540 EL-20-350 not dimmable, Item no. 8980202535 EL-20-350 D dim C, dimmable via trailing edge phase control, Item no. 8970203500 EL-20-Uni 350-700 dimmable Dali/push/1-10V