Aqualuma Underwater Light Gen-4 18 TRI Series. The colourful Tri Series is all about offering choice. Deciding which Aqualuma product to purchase has just been made easier. The Tri Series combines the brilliance of the blue and white LEDs within the body of the 12 and 18 Series and offers customers the choice of two colours (9 blue and 9 white LEDs) in the one housing. Choose to operate just one colour, or run them together to get a mix of the two, at an intensity that is equal to the 18 Series. Manufactured in the incredibly robust one-piece, corrosion-proof and injection-molded polymer housing.