AllPondSolutions 18 W PLL UV-lamp / 4-pinslamp - Vijver/Aquarium

Finally found a bulb that actually matches the 4-pin base on my old UV clarifier, no more fiddling with adapters. It fires up instantly and the 18w output seems strong enough to keep the pond water clear. The length is exactly what I measured, so it slid right into the housing without any forcing.

I replaced my old UV bulb with this one and it fit perfectly thanks to the 4 pin base being exactly what I needed. The 18w output seems to be clearing the green water in my pond noticeably faster than the previous bulb. Only small issue is the pins felt a bit snug to insert, but it works fine once s

The 4-pin base lined up perfectly with my old lamp, so swapping it out took less than five minutes. Wish the listing had included the exact length measurement upfront, but the 18w output looks just as bright as before.