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This UV PL lamp has a shorter length than the standard lamp, especially for use in devices with a shorter quartz such as the SuperFish Combi Clear 4000. Visit www.aquadistri.com in our pond catalogue for our UV pointer there you will find information on which lamp fits which device. Replace the UVC lamp annually preferably in spring for optimal operation. The fact that a bulb is burning does not mean that it still has useful radiation, as the UV radiation decreases and is no longer effective after 8.000 burning hours.