CureUV Brand UVC Bulb for Dynamic Air Quality Solutions GRS2000 24 Inch Model Bulb Number_397 036118 Operating Range UVA UVB UVC Operating Range UVA UVB UVC UVV High Standard 302195 SHA 302195 SHB 302195 SHV High Nitro Purge 302195 PHA 302195 PHB 302195 PHV Mid Standard 302195 SMA 302195 SMB 302195 SMC 302195 SMV Mid Nitro Purge 302195 PMA 302195 PMB 302195 PMC 302195 PMV Low Standard 302195 SLA 302195 SLB 302195 SLC 302195 SLV Low Nitro Purge 302195 PLA 302195 PLB 302195 PLC 302195 PLV This ultraviolet purification lamp features instant starting and utilizes a coil filament that operates at high temperatures This method of ultraviolet purification makes water safe for human consumption without the side effects of chemicals such as chlorine ensuring you get the best performance out of your UVC system