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Frequently asked questions

Match your system's wattage (15W, 30W, 55W, or 75W) printed on your existing lamp or system label — these lamps also fit several compatible systems including Liff P-series, Silverline UV-DS, and Daro ECO models.

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.

Not usually — lamp holders and leads (like the 47900 push-fit holder or UVP0029 holder and lead) only need replacing if damaged or corroded. If your system won't power a known-good lamp, check the holder and lead before assuming the lamp itself is at fault.

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.