... material--quartz glass,long life, ozone type & ozone free type VH means ozone typebrief introduction:UV Germicidal lamps emit ... used for product surface disinfection, water treatment sterilization,water filter, curing system,ozone generator,air purification, food storage and photochemistry ... Good quality material--quartz glass,long life, ozone type & ozone free typeShape: Straight,U-shape,pen-shape, ...