This Emperor Aquatics (Pentair Aquatics) 25W GT5 UV Sterilizer replacement lamp is a genuine lamp sold to us by Pentair Aquatics (Pentair purchased Emperor). It is the official replacement lamp for all Emperor Aquatics & Pentair Aquatics 25W UV Sterilizers. The length of the lamp is 18.5 inches (not including the pins). Do NOT use this lamp for UV sterilizers NOT manufactured by Emperor Aquatics or Pentair Aquatics.

There are many companies selling selling cheap, inferior knock-offs of this lamp. The Pentair part# for this lamp is FL-2542-IP. The part number and the Pentair logo are printed on the lamp. The knock-offs will not have this. This lamp corresponds to Emperor Aquatics part# 20025.

UV lamps should be replaced every year. When replacing the lamp it's also a good idea to replace the o-rings. The Emperor Aquatics Smart UV Sterilizer Service Kit has all six replacement o-rings. By replacing the o-rings you will greatly lessen the likelihood of leaking that may destroy the bulb and ballast.

NOTE: If your UV lamp is not lighting up and you've only been running the lamp for a two years or less, there is a very good chance the lamp has not burned out. Emperor lamps typically stay lit for years, but need to be replaced yearly because they lose intensity. The problem might be the Power Supply.