Single-end H shape UV germicidal lamps CHARACTER:A.long life-span.B.Easily setting for its ... For example: ZW40S25Y-Z1199 stands for:UV germicidal lamp ,150W, double-ended, OD 25mm, ozone produce, ozone free, tube length is 1199mm For exampleZW13D12Y ... stands for:UV germicidal lamp,150W,double-endedS,OD 15MM,ozone produceYozone freeW,tube length is 1554MM Single-end H shape UV germicidal lamps