Double-ended one pin UV germicidal lanps Quick start, save the circuitry, simplify ... For example: ZW40S25Y-Z1199 stands for:UV germicidal lamp ,150W, double-ended, OD 25mm, ozone produce, ozone free, tube length is ... is 1554MMFor exampleZW65S15Y-Z1554 stands for:UV germicidal lamp,150W,double-endedS,OD 15MM,ozone produceYozone freeW,tube length is 1554MM ...