Siemens - LP4220 UV Light Bulb for Germicidal Water Treatment H42C3F6 or place the substrate closer

or place the substrate closer to the mountable unit

as much as we might follow that advice

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This replacement is not an authentic Atlantic Ultraviolet brand UVC bulb

Siemens - LP4220 UV Light Bulb for Germicidal Water Treatment H42C3F6 or place the substrate closerGuaranteed Replacement Ultraviolet (UV) Bulb 4 Pin Single End 10 Watts 8. 35 Inch Length Lamp Worry Free Performance for 1 Year The Siemens LP4220 UV Light Bulb For Germicidal Water Treatment is a guaranteed replacement UV bulb that gives you worry free performance for an entire year. The 10Watts bulb has a length of 8. 35" and a four pin on a single end base. The ceramic bulb has low mercury dosage to meet environmental demands. This method of