Custom Design Service Guarantee: a: Manufacture is to CE&ISO9001:2000 standard. b: Product is guaranteed for 12 months after lamp purchase. c: According to the International Standard: AQL tolerance is within 2% of the total quantity per order. d: If AQL tolerance exceeds 2%, SNXIN will refund the buyer at 1:1 rate; OR an amount equal to the UQL value will be deducted from next order. e: 2% of products are added by SNXIN to the ordered quantity for back-up purposes.