T5 Lamps

Keep your pond water crystal clear and eliminate green pea soup algae with our range of high-output T5 lamps, slimline UV-C replacement tubes, and linear clarifier bulbs. Engineered specifically for modern, high-efficiency pond ultraviolet clarifiers and stainless steel sterilisers, T5 lamps deliver concentrated germicidal radiation from a compact 16mm profile to flocculate suspended single-celled algae and suppress waterborne pathogens, ensuring pristine water clarity and a healthy environment for your fish.

Featuring standard miniature two-pin contact caps at each end (G5 base), our replacement T5 lamps are manufactured with high-purity glass to ensure maximum transmission of 254-nanometre ultraviolet-C radiation into circulating pond water. Designed to operate smoothly with high-frequency electronic ballasts, these slimline tubes run cooler and produce higher irradiance than traditional thicker tubes. Because the active germicidal output of UV lamps diminishes steadily after six to twelve months of continuous running (even while the lamp still appears to glow blue), installing a fresh T5 bulb at the start of spring guarantees peak clearing performance throughout the sunniest months when algae growth is most aggressive. Our collection includes standard and high-output wattages, including 4W, 8W, 16W, 25W, 40W, and 75W sizes, making it simple to find an exact direct replacement for your clarifier.