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Frequently asked questions

Wonder lamps are coded by model and wattage (e.g. T510, T521, T529, T540, T565, T680, T6100/T6120). Check the code printed on your existing lamp or system housing, then match it to the corresponding listing.

Roughly every 9,000–12,000 hours, around once a year for typical continuous use — UV output drops before the lamp visibly fails, so don't wait for it to go out.

The range spans from 12W lamps up to 100W lamps, covering smaller domestic and light-commercial systems through to higher-output units like the F-35/FC-35/FS-35 and F-24/FC-24/FS-24 models. Check the specific product listing for exact wattage and fitting details.

We'd recommend sticking with the matched lamp code, since UV output and fit are engineered to the specific chamber — check with us if you're unsure of an equivalent.

The lamp keeps lighting up but its UV output falls below the level needed for reliable disinfection, so water may no longer be properly treated even though the system looks like it's working.