... ,OD 17MM,ozone produceYozone freeW,tube length is 553MMFor exampleZW95D15Y-Z1550 stands for:UV germicidal lamp,95W,single-endedD,OD ... 15MM,ozone produceYozone freeW,tube length is 1550MMFor exampleZW95D19Y-Z1554 stands for:UV germicidal lamp,150W,single-endedD,OD ... 19MM,ozone produceYozone freeW,tube length is 1554MMFor exampleZW65S15Y-Z1554 stands for:UV germicidal lamp,150W,double-endedS,OD ...