... Decline: 3% in the frist 1000hours 5. Lumen: 270lm(6000k) 6. Light color: Warm white<2500K-3500K>; Neutral white: <3500K-5, 000K ... hoursRelevant Certificate CE, RoHS,Warranty 2 years Optical Data :Light Color Warm White, Neutral White, Cool White,R,G,B,Y ... Color Temperature 2,500-3,500K / 3,600-5,000K / 5, ...