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. Uniform LED light distribution across the entire light emission surface. Material: aluminum/diffuser disc and light guide made of PMMA (non-yellowing) Dimensions (xH): 170x22 mm Color rendering index Ra: 82 Color difference (MacAdam): 3 SDCM Lifespan: 50,000 h (L80 B10) Operating device: not included Dimming: via trailing edge Operating device recommendation: Item no. 8990153510 EL-15-350 not dim, not dimmable Item no. 8990153500 EL-15-350 D dim C, dimmable via trailing edge