Best 4-Pin UV Bulbs of 2025

The DuraBulb UV Bulb is designed for use in 9W money checkers like the PolyCheck 9W and Safescan models. It emits UV light at a peak wavelength of 365nm, which is ideal for revealing the UV marks on banknotes. This feature ensures you can easily verify the authenticity of both polymer and paper notes. With a length of 150mm and a width of 35mm, it fits seamlessly into compatible devices, providing you with a reliable tool for secure transactions.

The AquaHouse 55W UV Lamp is a 55-watt replacement bulb designed for UV systems with a 4-pin connector at one end. Measuring 925mm in length and 15mm in diameter, it ensures compatibility with specific 55w UV setups. Its lifespan of up to one year provides long-term use, while supporting a maximum flow rate of 45 litres per minute. To maximise its effectiveness, it is essential to use proper pre-filtration, helping you maintain a clean and efficient water sterilisation system.

The AquaHouse AH-UV-25-L Lamp is specifically designed for the AH-UV25 25W UV water treatment system. With a length of 565mm and a diameter of 15mm, this replacement bulb is tailored for systems using a 4-pin connector at one end. It supports a maximum flow rate of up to 18 litres per minute, ensuring effective water sterilisation. Additionally, the lamp has a lifespan of up to one year, providing a reliable solution for your water purification needs. Proper pre-filtration is recommended to enhance its effectiveness.

The DuraBulb UV Note Checkers are ideal for ensuring the authenticity of your banknotes. These 4W UV bulbs, measuring 135mm (excluding pins), are specifically designed as replacements for various UV note checkers. With a peak wavelength of 365nm, they effectively illuminate the UV marks on both polymer and paper banknotes, making it easier for you to spot counterfeits. Their long-lasting design guarantees reliability, ensuring you can check notes with confidence over time.

The Liuyife UV Disinfection Lamp is a 36W 2G11 4-PIN bulb designed for effective purification and disinfection. It helps to inhibit algae growth and bacterial reproduction, ensuring a cleaner environment for your fish ponds and aquariums. With its easy installation process, you can quickly set it up by simply inserting the appropriate filter, which makes maintenance hassle-free. Remember to use gloves or paper towels to handle it, as this can prolong its lifespan. Regular replacement every 12 months ensures optimal performance, keeping your aquatic space healthy.

The Pisces 18w UV Bulb is designed to enhance your pond or aquarium experience. With a length of 215mm and a convenient slip-in base with four pins, installation is straightforward. This bulb features two adjacent glass tubes that effectively combat green algae, improving the clarity of your water. The high-quality materials used ensure durability, while the strong ultraviolet light breaks down algae as water passes through. Replacing your UV bulb annually will keep your filtration system operating at peak efficiency.

The Pondh2o UV-C Bulbs are designed to enhance the clarity and quality of your water garden or koi fish pond. With a 55 Watt 4 Pin Base, these bulbs provide powerful germicidal properties that help keep your pond clean. Their quartz glass construction ensures durability and efficient performance. You can expect an impressive average life of 8000 hours, giving you peace of mind and reducing the need for frequent replacements. This value twin pack offers great convenience for maintaining your UVC filters and clarifiers.

The DuraBulb 18W UV Bulbs are designed for optimal performance in pond filters and aquarium systems. This twin pack includes two 18W 4-pin PLL tubes, measuring 21.5cm, ensuring you have a reliable replacement ready when needed. With a UV output of 253.7nm, these bulbs provide maximum sterilisation, keeping your aquatic environment healthy. Regularly changing these bulbs helps maintain their effectiveness, giving you peace of mind that your pond or aquarium is well-protected.

The Pisces 18W UV Bulb is designed to enhance the clarity of your pond or aquarium water. With its 215mm length and 4-pin base, it easily fits into most pond filters and UV systems. Made from durable materials, this bulb effectively combats green algae, ensuring your water remains clear. When you replace an old or inefficient bulb with a new one, you can significantly boost the performance of your filtration system, providing you with a healthier aquatic environment.

The Pisces 36w UV Bulb is designed for effective pond and aquarium maintenance. Made from high-quality materials, this bulb ensures durability while effectively clearing algae from your water. Its powerful ultraviolet light works to eliminate unsightly green algae, improving your filtration system's efficiency. Additionally, it is simple to fit into your pond UV filter, making replacement a hassle-free task every 12 months. Enjoy cleaner water with minimal effort using this reliable UV bulb.