Key Specifications ◇Watt：5W/7W/9W/11W/13W ◇Bulb Type:T4 ◇Base:G23/G?23 ◇Wave length:254nm with or without ozone ◇This wave length has particular strong effect on nucleoalbumin, and causes variations or death of germs. ◇Germicidal lamps can be made of quartz glass or boric glass. ◇Quartz glass can transmit more than 90%of the ultra-violet rays. ◇Boric glass can transmit 70% of the ultra-violet rays. ◇These lamps are used in various sterilizers, air purifiers and water purifiers, etc. ◇Avoid direct exposure of eyes and skin under these lamps. ◇They are used with electronic or magnetic ballast. Origin China